Solution Epsilon

Solution Epsilon (ソリュシャン・イプシロン, Solution・Ε) is a slime battle maid and a member of the "Pleiades Six Stars," the battle maid squad of the Great Tomb of Nazarick. She was created by Herohero.

Appearance
Solution is a blonde beauty with spiral curls and blue eyes, and clothing that emphasizes her sex appeal. The top of her maid uniform is designed to open easily, so Solution can absorb victims into her body. She is said to rival the most beautiful woman in the Re-Estize Kingdom, the Golden Princess. As she is of the slime race, Solution can change her appearance as she wishes.

Personality
Solution thinks of humans as food and toys. She loves to swallow humans alive and enjoys the suffering and the struggling of her victims. Solution tends lure to lustful men who are after her body in with a literal boobytrap by exposing her chest to them, tricking them into touching her so that she can then absorb them thereafter. She does not mind the screams of humans during their last moments before consuming her victims with her body. She is, along with Narberal Gamma, one of the two "extremely dangerous" Pleiades.

She is also good at disguising her nature, acting like a childish and rude lady when she is out getting information with Sebas. It seems that her true nature is quite logical, which is suggested by her complaint about the inefficient behaviors of Sebas or Entoma.

She is willing to meet and face her superior and someone a lot stronger than her with force if she feels that their actions disregard Nazarick's benefits or bring danger to Nazarick. She is able to independently make decisions on her own when needed and even betray her superior if she feels that they are obstructing Nazarick's plans.

Background
Solution Epsilon was created by Herohero to be one of the battle maids, the Pleiades. They served as a last line of defense against intruders. However, because she is unlikely to be able to stand against enemy players who managed to come this far, her only real purpose was to distract the invaders until the guild members of Ainz Ooal Gown were able to fully prepare for their final stand in the throne room.

The Undead King Arc
Solution, along with her sisters, were ordered by Momonga to guard the 9th Floor. She and the other Pleiades were on standby in wait for Momonga.

The Bloody Valkyrie Arc
Solution disguises herself as a spoiled rich mistress from the Baharuth Empire while Sebas Tian acts as her butler who follows her every command, despite being her superior in reality. In the Shining Golden Pavilion, Solution intentionally makes loud complaints about the food, giving everyone a bad impression of her. She rudely tells Sebas to ready the carriage and departs immediately. In private, she apologizes to Sebas for her actions while talking about Zach acting according to their plan, silently spying on him. Solution tells Sebas that she wants that human for herself and Sebas replies that she will have to ask permission from Shalltear to have her request accepted.

As the carriage goes on its way, she asks for Shalltear's permission to devour Zach, which she receives, much to her delight. When the bandits targeting them have been lured out, they are slaughtered by Shalltear and her Vampire Brides as Solution devours Zach. Solution has a brief discussion with Shalltear about how she is able to take care of Zach inside her as a Predator Slime. She makes a promise with Shalltear, who suggests that they can have fun together once again whenever Nazarick receives intruders, which the two agree to share between themselves. She and Sebas split off from Shalltear and continue on their way to the Royal Capital.

The Maid Tea Party Arc
Solution participates in the monthly Pleiades report and tea party along with her sisters. She reports about her work with Sebas in the Kingdom. She informs her sisters about the job progressing smoothly. When Narberal reports her work with Ainz, Solution and the others get jealous of Naberal's closeness with Ainz. Solution states that she likes the meat of young girls and that she likes the sensation of eating humans alive. She asks Yuri if they can request Ainz to let them have one of the humans that are being interrogated while they're still alive.

The Men in the Kingdom Arc
and The Men in the Kingdom II Arc Solution greets Sebas but notices that he has brought a human with him and tells him that a human may jeopardize their mission. Despite this, she is ordered to heal the human and not report this incident to Ainz. After some time, a group of guards led by Staffan Heivish and Succulent appears at their temporary residence, accusing them of involving themselves with slave trafficking and for having bought Tuare as a slave. They then demand that they pay a heavy fine and turn over Tuare to their custody. Once they leave, Solution asks Sebas to dispose of the human before she causes more trouble for their mission. When Sebas leaves, Solution decides to contact Ainz and inform him that Sebas may have gone rogue.

She welcomes Sebas back and informs him of their master, Ainz Ooal Gown, waiting for him. After confirming Sebas' loyalty, she and Sebas prepare to return to Nazarick after buying wheat. Sebas tells Solution that Tuare has been kidnapped and asks her to inform Ainz of the same. After Sebas kills four members of the Six Arms, she proceeds to kidnap the audience. Solution participates in Demiurge's plan to make Momon a lasting hero in the Re-Estize Kingdom. She plays the part along with the other battle maids, excluding Narberal, of acting as Jaldabaoth's underlings with her face disguised with a mask. She partners with Lupusregina Beta and Entoma Vasilissa Zeta. They fight against Nabe and continue to do so until Jaldabaoth orders a retreat.

The Invaders of the Large Tomb Arc
When Ainz holds a grand court in the Throne Room, he speaks to each of his personal level servants, asking what they want as a reward for their efforts. Solution requests to be given humans, particularly virgins, for her to devour. Ainz partially grants her request, giving her the captured Eight Fingers' agents, but refuses to give her any virgins.

Solution, along with her fellow Pleiades, except for Narberal, encounters Dragon Hunt on the surface of the Great Tomb of Nazarick. They have been sent to see if the Nazarick Old Guarders are able to capture enemies trying to escape from the tomb. To her and the other Pleiades' surprise, Dragon Hunt decides to stay and fight. She and her sisters try to cheer for the Dragon Hunt workers, but they are easily slaughtered by the Nazarick Old Guarders.

The Pleiades Day Arc
Sometime after the annexation of E-Rantel, Solution kidnaps Miyoshi out of jealousy for his duty in washing Ainz's body. When questioned directly by Ainz, she remains silent on Miyoshi's whereabouts, forcing Ainz to ask Yuri Alpha to compel the answer from her. She reveals her actions after being pressured by Yuri, claiming she wants to wash Ainz's body. Expecting to be punished, Ainz calmly explains such duties are beneath her station as a daughter of Herohero. After apologizing to Ainz, Solution extracts Miyoshi from herself. Ainz orders her to return the slime back to where she found him after he is washed.

The Witch of the Falling Kingdom Arc
When Ainz Ooal Gown is called back from E-Rantel, Solution greets him at Nazarick. She returns to Ainz his Ring of Ainz Ooal Gown in order to teleport to the 10th Floor.

Mass for the Dead Arc
At the time of the Great Tomb of Nazarick's transfer to the New World, Solution Epsilon was among the NPCs that were killed in the transition. Momonga finding the dungeon in ruins due to the strange Cracks and overrun by Chaos Beasts quickly revived her and the Pleiades with magic. Unfortunately the maid suffered a severe abnormal drop in levels since her revival as did the other NPCs that were brought back to life. When the protagonist appeared before Momonga who was suspicious on the identity of the homunculus, Solution can be one maids that vouches on his identity as being a creation of Herohero. After the protagonist leaves with a Redeem Slime summon and Narberal Gamma, Solution is left with the remaining Pleiades in Nazarick. To rebuild Nazarick, more information was needed to determine the new phenomena that was now affecting the dungeon. Thus Momonga had the maids train to prepare for a survey of the Cracks. When they were deemed ready Solution and her sisters investigated the Cracks, fighting the Chaos Beasts to learn its secrets.

Solution with the rest of her sisters greeted Narberal Gamma upon her return from the outside world. From the doppelgänger she gained some insight on human society and started practicing on how to communicate with them by referring them as "maggots". It gained some attention from Sebas Tian and Momonga who intervene to correct some misconceptions and focus their training on hospitality. The slime would help Demiurge's project in creating the Throne of Death as a replacement to the Throne of Kings, by devouring the human that provided the skin for the leather after the demon was done harvesting.

While repairing the baths on the 9th Floor, Solution learned from Yuri of the existence of Miyoshi the personal bathing attendant of Momonga. Jealous of the slime's position the maid kidnapped Miyoshi, hiding him in her body believing that if he were to disappear the role of cleaning Momonga who fall to her. The results of her kidnapping were not as planned, as the disappearance of Miyoshi led Momonga and others that an intruder was in Nazarick. It caused a lockdown of the tomb and a wide search which caused Solution to be in horror at the wild goose chase she caused. The maid tried to hide her involvement in the kidnapping but as things began to spiral more out of control, Solution caved in and confessed to the Floor Guardians and Momonga. Though she confessed to the crime she refused to divulged the reason so Yuri was brought to compel her and release Miyoshi. After she divulged the reason, Momonga rather than be angry at her deception was curious that she was able to do such a thing and was curious at the limits of how far she would go. In the end Momonga apologized if he made her feel insignificant for not asking her to be his bathing attendant, and explained that he could not ask her as she was the daughter of his friend Herohero and thus would be improper. The maid would assist in bringing an air of hospitality to the healing Nazarick by taking over CZ2I28 Delta's shift to allow the other maid to create a flower garden on the 6th Floor.

Solution would infiltrate the Re-Estize Kingdom under the alias, Soi, as an adventurer in E-Rantel. She appeared weeks before the protagonist and Slimeko arrived at the city. As Soi she was a abrasive new copper rank adventurer annoyed by her low standing. Upon seeing the protagonist given the opportunity to be promoted based on his skills she demanded the same treatment to advance at the guild. After the protagonist and her prove their worth and are given the opportunity to be bumped up on the adventurer ranking, the protagonist instead declines wanting to earn it the fair way. His decision is followed in suit by Soi who invites herself on his team. Once the three were alone, Soi dropped the act and greeted them properly explaining her mission was to meet up with them and casually join them as an adventurer without associating Nazarick. She also brings them up to speed that another agent, Sebas Tian has also infiltrated the city. That being said the trio then go out to make a name for themselves as adventurers. One of the first jobs they received is by referral of Saint Clementine to assist Sophie Noia to collect samples of the Sanitary Slimes in the sewers of the city. The trio expected the job to be simple, but find that the once passive slimes have gone aggressive and hostile. The three managed to survive the encounter and also discovered a hidden room in the sewer system that bring more questions.

Returning back to the guild, they were welcomed warmly by Saint Clementine on their success. After the slime samples were given to Sophie, Soi warned her comrades about Clementine as she could tell that the woman was masking her emotions. The group then takes a job to provide security for the Quarry near the city and where Sebas Tian is working. When they arrive at the mine they learn of an individual with a reputation for being selfless and kind, which Soi figures out to be Sebas, the butler's alias. It appears Sebas has been protecting the human miners from injury, using his superior strength to save them from mining accidents and drive away the local demi-human raiders. The actions cause Soi to scold Sebas as their orders were explicit in not drawing unwanted attention in their given professions. Thinking that he has been letting the humans become too reliant on him she helped the undercover butler to orchestrate a situation where the miners would have to come to rescue Sebas. It works and allows Sebas to maintain his cover.

Soi would meet one of the protagonist's associates Nigun Grid Luin and Ian Als Heim of the Sunlight Scripture. At this point the captain of the Sculpture shocks her as he already knows her name having kept tabs on the protagonist's entry in the Adventurer's Guild. She is unimpressed by the man and was willing to comply with Nigun to have a duel to test her and the protagonists' skills. The resulting duel was a draw but it was enough to convince Nigun that the two were strong.

Solution working under her alias of Soi would escort a group of peculiar visitors to Nazarick that emerged from the Crack on the 10th Floor. She had to deal with one of the more interesting characters who was a masochist and seemed intent only allowing herself to have her clothes devoured by Fiber-Eating Slimes. To get her attention Soi had to bribe the woman with a torture device from Neuronist Painkill's collection. After the guests left another event occurred in Nazarick, this time involving a competition between Shalltear and Albedo over the right to be Momonga's queen. In a test of "Open Problem Solving", Solution was paired with Albedo to help defeat the Chaos Beasts flooding the Throne Room as part of the challenge. Unfortunately she and Albedo do not win and victory went to Shalltear and her partner Narberal.

The slime assisted in other Nazarick missions, such as venturing out through an unstable [Gate] to explore a Mysterious Island with the Pleiades. Gifted with her own swimsuit, Solution surveyed the island with her sisters, the protagonist and Slimeko. The slime maid helped protect her comrades from wild slimes and locate what appeared to be an abandoned pirates port. After killing the undead pirates and the Giant Mollusk she and the others claimed what was left of the pirate crew's plunder.

Soi's team's fame began to grow with promise due to their already rising status as platinum adventurers. The group would attract the attention of the city officials as they took more hazardous jobs like undead subjugation at the E-Rantel's Cemetery. On another they were contracted by the Pharmacist's Guild to acquire soil samples from the Great Forest of Tob for a herb cultivation project. At the same time Lizzie Bareare hired them to retrieve some items belonging to her grandson's friend in Carne Village. At the forest she finally meets Nazarick's newest recruit, Hamsuke. After the job the group then take on another undead clean up mission in the Katze Plains where they meet Leinas Rockbruise and Nimble Arc Dale Anoch. Once that was done, Soi helped escort a supply caravan through the fog when they were attacked by undead, which included a Skeletal Dragon that she proceeded to defeat. As the journey continued her team were instrumental in repelling an attack by a Death Knight, impressing the imperial knights.

Upon their return to E-Rantel, Soi's team were brought to a hearing to stand accused by Lakyus Alvein Dale Aindra for being involved in a plot to sabotage the city. Since the slime samples they brought back to Sophie on their first job showed signs of contamination of high levels of alchemical solutions they were suspected of supplying the substance to Hilma Cygnaeus, a current member of the Pharmacist's Guild but at one time a high ranking executive of Eight Fingers. Their involvement in the mutation of the slimes is later proven to be null as it was determined that the adventurers could not have supplied enough herbs to Hilma as they job was only recent. The culprit turned out to be an accident from run off water from the herb field that entered the sewers and caused the slimes to undergo their violent change. With the city in danger of a massive swarm of mutant slimes, Soi's team volunteered to handle them. At the Sewage Treatment Plant they met with Sebas who was contacted by Soi to aid them. The mutant slimes are killed and the team faces off against a Super Giant Sanitary Slime. Soi helps defeat it by using her superior acid to kill it and claim its slime core as proof of their victory.

For her contributions to Nazarick, Solution requested to be given live humans to consume from her master Momonga. When Princess Renner Theiere Chardelon Ryle Vaiself hired Soi's team to find the culprits of the missing refugees in E-Rantel, Soi played the role of the skeptic believing that the humans just gave into despair and committed suicide. After her team began working in conjunction with Blue Roses, Soi attracted the attentions of Tia due to her skills as an assassin. When the two teams were chasing suspects after catching them in a sting operation, Soi managed to keep on their trail using her experience in locating hidden passages like in the E-Rantel sewers. CZ2I28 Delta assisted in the capture of one of the suspects from the shadows. To prevent her involvement from being discovered, Soi took credit for the take down. The adventurers track the source of the scheme to the E-Rantel's Cemetery where they find Six Arms and Zurrernorn conspiring with one another. Soi fought with Evileye against Davernoch taking pleasure in killing the undead as he had the gall to call himself the Undead King. Khajiit Dale Badantel who was alone after his allies fell, attempted to start Death Spiral but CZ2I28 Delta killed him from sniper range. Once again Soi took credit of the kill to keep maintain her cover though it earned her the respect of Blue Roses.

The maid would later use her adventurer identity to go with the protagonist, Sebas Tian and Slimeko to the Mine Dungeon to assist Abyss Demon in doing a survey of a new vein of ore in the mine. Solution would also join Sebas Tian's team, Butler and Maid, for the Nazrzick Fighting Tournament though her team lost against Crimson Temple.

Other assignments were more mundane such as baking Christmas Cakes for Nazarick's Christmas party. However she accidentally used her own acid instead of lemon juice much to Yuri's irritation. While on assignment in E-Rantel, Solution's adventurer team would be recalled back to Nazarick to handle an unprecedented crisis that was affecting Nazarick. All of the NPCs had fallen under some sort of New Year's spell and the dungeon was rampant with strange new monsters. The source of the mental effect is tracked to a Chaos Zone that appeared in Fake Nazarick. There Solution encounters several of her own comrades encouraging her and her team to complete a series of challenges. The maid mainly acts as a scout during the mission, though she assist in helping the protagonist and Momonga slay Shiramochi-ō, the mastermind behind the crisis. However Shiramochi-ō's death caused a time loop, restarting the events of the crisis with slightly different series of events. Though Solution still was recalled back to Nazarick with her team to set things right, but were joined by a new comrade named Shiro. In the end it turned out Shiro was really Shiramochi-ō who had lost his memories. After the White Mochi King regained his memories, having grown close to his new friends allowed himself to be killed by Momonga as it was the only way to remove the spell over Nazarick.

More visitors to Nazarick came from the Crack on the 10th Floor, and Solution would be assigned to escort the strangers during their stay in Nazarick. On her assignment she guided them to the Tob Forests to have them conduct a series of experiments on their abilities with Aura. At the time of the second summit meeting of the Tripartite Alliance, Solution's adventurer team were hired by the royal family of the Re-Estize Kingdom. Acting as Soi her team participated in a mock battle against the Baharuth Empire's warriors for the honor of the Kingdom. She fought against the likes of Zero, Nimble Arc Dale Anoch and even Fluder Paradyne. While fighting with Gazef Stronoff against Fluder, the match was called off as the fortress city of E-Rantel was being attacked by a horde of Chaos Beasts. Soi's team later saved the city from being destroyed by acting as the vanguard of the city and slaying the alpha leader of the horde.

After that adventure, Soi would find her next mission to the ruined Roble Holy Kingdom with Momonga. She was sent as part of his expedition under her alias Soi just in case it was necessary to negotiate with human survivors. Though when the reached the Great Wall and Kalinsha the areas were devoid of human life. The expedition made a discovery of a strange artifact found in a cathedral of Kalinsha and after killing its guardian it was transported back to the tomb.

In E-Rantel as Soi, her team were contracted by the royal family once again this time to locate and rescue a missing Gazef Stronoff. Her team worked with Blue Roses and tracked the Warrior Captain's last known location to be at the Northern Cave. Together and with the help of Brain Unglaus Soi's team defeated two Spear Chaos Beasts that were guarding the entrances. Once they were defeated, Soi and her team were sent to find Gazef and any survivors. Within the cave network, Shalltear Bloodfallen emerges from hiding to aid the undercover adventurers as "Shall" a noble adventurer. The group then followed Gazef's trail leading to a cavern containing a Crack. Soi is confused as the entire cave is filled with Chaos Stones indicating Chaos Beasts were recently slain, but by who eludes her until a feral Gazef Stronoff attacks her team. It takes the combine might of Soi and Shall to defeat him and render him unconscious. They are attacked by another entity but after a hard battle they defeat it and bring both Gazef back to E-Rantel and transport the other creature to Nazarick.

Solution would be assigned to guard a new batch of visitors from the Crack, this time shadowing a group when one of their own went rogue. While guarding them on a trip to the Tob Forests, Solution and the Pleiades had to head to a disturbance where Demiurge's Enhanced Treant farm was where they found a girl with cloning abilities. After it was determined that the girl was an associate of their guests of Nazarick so Solution reported the news to Momonga. The Predator Slime was assigned to guard the new visitor, and though she initially acted cold to her, Solution warmed up to her as they had similar mentalities in being predators and even gave her some relationship advice.

Solution was supportive of Shalltear's pursuit of a relationship with Momonga. This is displayed when she uncovered a plot by her teammates: Slimeko and the protagonist secretly helping Albedo seduce Momonga by isolating their master on the 9th Floor during a security drill. She suspected something was going on and get the truth out of Slimeko after the younger slime cracked under pressure. Solution warned Shalltear of the ploy and it was just in time as it helped the vampire prevent Albedo from raping Momonga in his own chambers. More visitors from another world were brought from the Crack, among the new batch was a magic caster whose spell could cause impressive damage. In her adventurer disguise Soi was part of the team that escorted the visitors to the Azerlisia Mountains to locate a gold vein for Nazarick, she later witnessed the spell in action after the magic caster used it to kill a Fire Dragon.

Evidence of players in a seaside village reached Nazarick, prompting Momonga to send his undercover adventurers to confirm it. The adventurers were supported from the shadows from the remaining members of the Pleiades. They had an unexpected encounter with Blue Roses were also seeking a dwarf named Tsuibayaya. The teams worked together to secure the dwarf's help as he was promised to make armors for the Kingdom. In exchange they helped the dwarf acquire scales from the Legendary Mermaid. The adventurers managed to win the scales from the merman, only thanks to the secret help from CZ2I28 Delta which Soi took credit for to hide Nazarick's involvement to Blue Roses.

The maid also assisted her sisters in solving a mysterious haunting of the Tob Forests. At the time the hauntings was blamed on evil spirits of the land around Carne Village. To appease them Solution helped her sisters in setting up a Harvest Festival in the ruined village. The festival though was attacked by a fox-like creature named Kyuko who was responsible for strange occurrences. The Pleiades fought her with the help of Aura but managed to subdue her but the events saw Kyuko willingly join Nazarick.

A new group of visitors from the Crack, composed of a trio of goddesses led by an overly cautious hero soon found themselves guests of Nazarick. To cater to the paranoid nature of the leader, Solution, Narberal, Slimeko and the protagonist took their guests outside to allow the group to hunt for their own food. They were attacked by the Grim Reaper, forcing Solution and the others to defend themselves and their charges. The Grim Reaper was slayed by the hero, and Solution used her healing magic scrolls to heal him of his near fatal injuries.

Momonga would receive a report from Solution who was browsing the Black Market where she spied Sebas Tian visiting a brothel. She told her master that she suspected Sebas Tian to be peddling information to another party on Nazarick. To determine if it was true Momonga had the undercover adventurers in E-Rantel investigate Sebas Tian's activities. Solution's suspicions turned to be misguided as it was later found out that the butler was investigating the brothel that was under the possession of the Black Market crime lord Cocco Doll in order to free a girl named Tuareninya Veyron. After Cocco Doll was arrested and given to the authorities it was learned that the brothel was being preyed upon by something as many of it employees turned up missing. After heading back to the brothel and following a hidden passageway to the sewers they found a demon named Isabella torturing the employees. Given that they were facing a New World demon, Isabella's capture took priority. After the demoness was defeated, Soi hid Isabella in her body to be transported back to Nazarick for a proper interrogation. Solution would help Tuare go to sleep in order to prevent her form eavesdropping on Nazarick privy matters when Momonga came to E-Rantel to discuss Sebas Tian's unsanctioned investigation.

While taking a break at a bar in E-Rantel, Soi and her team noticed a strange trio nearby that seemed to be off given their clothes and behavior atypical of adventurers and workers. Their hunch turned out to be correct as the group were actually visitors from another world sent to assassinate another group. The undercover adventurers had to fight them as the targets were under Nazarick's protection.

King Ramposa III who wished to reward her team for saving Gazef Stronoff had Soi's team summoned before him. The protagonist doing the negotiations requested the city rights of E-Rantel surprising many. After the meeting with the king, the adventurers encountered a mentally disturbed Nfirea Bareare and learned of his grudge against the Chaos Beasts. Noting that he was a very unstable yet powerful individual, Soi added him to the list of names that Nazarick needed to keep an eye on.

During the Demon Emperor Jaldabaoth's attack on the city of E-Rantel, after Emperor Jircniv's deal with the demon when wrong, Soi played her part in Nazarick's scheme by staging a rescue of Emperor Jircniv just after she and the "Dark Warrior" saved him from being executed. Afterwards she and the Dark Warrior were hailed as heroes who saved the city.

A part of Solution's past would come back and haunt her, when the baths of Nazarick were finally repaired. The baths made her remember, Miyoshi a slime she kidnapped and started a false intruder alert during Nazarick's days of reconstruction. The "Miyoshi-kun's Disappearance Case" was brought to light to some members of the female NPCs, who after hearing her reasons for kidnapping Miyoshi tried to petition Momonga to elect themselves as his bathing attendant. Unable to discourage them and choose among them the Miyoshi Cup was devised as a way to find out who would have the honor of challenging Miyoshi's position. At the same time it helped select a team of women that were needed to fulfill the requirements to activate a Open Air Golem in the baths and disarm it. After four competitions and disabling the golem, Albedo, Shalltear, Lupusregina and Solution were at the final match against Momonga though all were defeated thus ending the competition. The results of the competition threw Solution in a depression, though to her astonishment Miyoshi comforted her having forgiven her for holding him captive when they met. The Sapphire Slime demonstrated his abilities which showed his cleaning expertise causing Solution to admit that he was more suit for the role of Momonga's bathing attendant.

To give Pandora's Actor a chance to experience a Christmas party, Momonga hosted a second one and had Narberal and Solution use their connections in E-Rantel to procure meat for the feast. When Lupusregina, Entoma and CZ returned to Nazarick after coming back from the mountains, Solution was among those at the party that listened to their adventure.

In an unexpected turn of events the Crack on the 10th Floor opened another portal to another world, and allowed Nazarick to be reunited with some previous acquaintances. Solution had the opportunity to greet her friend and the two share sometime to get reacquainted with one another. When it appeared that an evil clone of said friend was running amok, Solution lent her assistance in containing the entity. For the upcoming Project Valentine, Solution provided consultation to Shalltear Bloodfallen, helping her to create her chocolate dish.

Solution with the rest of the Pleiades would show their support to the nascent idol group, LittleMass and cheer at the final show in the Amphitheater. In the aftermath of the idol plan, Momonga decided to implement a similar plan in E-Rantel, under the suggestion of the protagonist to inspire the populace and raise their mental health. Thus through the Sorcerer Kingdom, the protagonist helped to organize an exhibition match that officially was there to raise adventurer recruits for the Adventurer's Guild. At the same time Soi having be raised to that of an adamantite adventurer due to her association with the protagonist, adopted a more ninja-like outfit after Guildmaster Pluton Ainzach asked her to improve her image. Under "Soi", the undercover adventurer helped establish the cover stories of Shalltear and Kyuko who infiltrated the tournament claiming that they were old friends when she traveled.

While playing her role as Soi in E-Rantel, her adventurer team is paid a visit by Prince Zanac, wishing to hire their services to investigate a string of disappearing bride candidates happening in Marquis Blumrush's territory. Given that the content of the mission might make the nobles unhappy, Soi wanted to pass on the request as she believed it would resolve itself. Though the protagonist thought differently after Zanac warned that if nothing was done not only the innocent will pay but his idiot brother might get involved and make things worse. Soi suspected that members of Eight Fingers were responsible. To get more information, Evileye and Narberal Gamma were selected to pose as brides. When Evileye refused to pretend to be one as she found it degrading. Soi using her convincing words managed to help Evileye talk about her insecurity of being a vulnerable bride until the magic caster agreed to do the assignment to prove her character.

During the mission Soi worked with not just her team but Blue Roses to find if Blumrush was truly the guilty party. As part of the survey team she collected testimonies from the victims, include a worried father whose daughters were taken while in the noble's territory. The team got pulled into a separate mission which was assisting the city soldiers in exterminating undead that appeared in a nearby mine. The undead were not irrelevant to their original mission as they were being drawn to the mine due to Zurrernorn, who were using the brides as sacrifices. To her surprise Soi learned that Davernoch, who she killed in her early days as an adventurer was alive. She was a bit embarrassed that she did not kill him properly. Her mistake was corrected by her sister Narberal who discovered which Soi was thankful for. Soi would later fight Evil Lord Greed who was positioned at the mine to provide his appearance as the smoking gun that would oust Blumrush as collaborating with not just a death cult but the Demon Emperor. After the mission was completed she and her team returned to Nazarick and were lauded for their work as their efforts helped to secure the mines around Re-Blumrushur for Nazarick's extraction.

In a performance test of Tsuibayaya's swimsuits against those in the Treasury Solution would be among the participants of the test. Like the others she concluded that the dwarf's creations were still inferior to those in Nazarick's possession. When the "Nazarick Swimsuit Athletic Meet" was organized, Solution chose to join Shalltear's Red Group. At the first competition called "Sandy Beach Obstacle Race" Solution was unable to gain any points at the finish line as she was not the first five to cross it. White Group won thanks to the extra points Albedo earned for defeating the obstacle monsters. In the second competition, which was the "Floating Island Survival", the maid was the fifth to jump on the platform and maintain her balance in the center of the float. Using Yuri's chest to bounce off she used the reflected force to knock off Narberal into water gaining Red Group's lead. The float would eventually break in half due to the weight of White Group. At the last competition of "Mix Gender Water Cavalry", Solution served as one of Shalltear's carriers. Ultimately the game turned into a tie, though Solution and the participants celebrated the game as it proved to be a fun experience.

E-Rantel was eventually transferred to the Sorcerer Kingdom as a reward for the protagonist for saving the city of E-Rantel from the Demon Emperor Jaldaboth. To officiate the city's transfer, Soi had to escort the Sorcerer Kingdom's prime minister, Albedo, to the city. After E-Rantel was officially given to the Sorcerer Kingdom, the protagonist was promoted to the role of Territory Guardian of the city and Soi accompanied the homunculus on his rounds around the city like the E-Rantel Magic Research Institute. Though it seems there was nothing to stop Nazarick's rise to power, tragedy struck when Shalltear who was out on an assignment was reported to be missing. Using the Mirror of Remote Viewing her trail was tracked to the Katze Plains. To determine what happened Soi came with her team to investigate with Momonga, Albedo and Cocytus. Teh group found evidence of an intense battle and also Shalltear under some sort of mental effect. When Momonga's magic failed to free her, a hasty retreat was ordered all the way back to Nazarick. It was there Momonga revealed to his subordinates that Shalltear was being affected by a World Item. In a effort to free Shalltear from the spell, Soi joined in a plan devised by the protagonist to use a legion of summons to weaken the vampire just enough to allow her to be lulled into the Depiction of Nature and Society where Momonga could strike the final blow.

Trivia

 * Her race is based on H. P. Lovecraft's Cthulhu Mythos.

Quotes

 * (To Zach): "Please don't be too excited. If possible...I'd like you to be gentle with me. It would make me very happy."
 * (To Zach): "The truth is, I deeply enjoy watching things dissolve. Therefore, I felt it was a happy coincidence that you wanted to be inside me, Zack-san."
 * (To Zach): "I'm sorry, but I am resistant to physical attacks, so a blow like that cannot harm me. Then, I shall dissolve it."
 * (To Zach): "I am a predatory Slime. Since time is limited, I will need to swallow you up."
 * (To Shalltear about Zach): "My apologies, I did not know he was still so full of energy."
 * (To Shalltear): "I could secrete a stronger acid to kill him immediately if you wish, but since a human who wishes to enter me is a rare occasion, I would like to let him enjoy it for an entire day."
 * (To Shalltear): "No, I did not. If I dissolved his throat with acid, he might suffocate due to being unable to breathe. Therefore, I inserted part of my body into him to suppress his voice, and it also has the effect of preventing bad smells."
 * (To Shalltear): "Then, please do not forget about my share. I would like to swallow them up to the chest and expose the rest of them. That ought to be quite interesting as well."
 * (To Ainz): "Why! Tell me why! I am a Slime too! I can clean you better than Miyoshi-kun-sama! Why! Why won't you let me bathe with you and lick your glorious body clean?!"

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