Magical Girl and the King of Magic

Magical Girl and the King of Magic (魔法少女と魔導の王) is a collaboration game event in Mass for the Dead with characters from Overlord and Magical Girl Lyrical Nanoha. It will be released on November 15, 2021 to December 15, 2021.

Background
To be swallowed by the sudden appearance of a crack to a different world that they have never seen. The story of a new encounter and farewell begins at the Great Tomb of Nazarick, where the undead kings and demons live. Magical Girl Lyrical Nanoha Detonation collaboration begins.

Incident
One early morning on Earth in Uminari City in Japan, Fate Testarossa and Hayate Yagami land from the sky at a park to investigate an alert on an anomaly. Though the area is devoid of activity and abnormality. Chrono Harlaown communicating the the two girls via remote from base states that there should be some sort of reaction just 150 meters from them and that the phenomenon may just not be visible. Hayate is curious to know what kind of anomaly they are dealing with but Chrono and those with him don't know as it is unidentified, only stating that it is "a minute space-time distortion that resembles a dimensional earthquake". If left alone it may be cause a serious disaster. Until the containment team arrives to quarantine the area, Chrono orders the two to monitor their position. Supporting the two from afar is Nanoha Takamachi but Fate is worried of her friend's participation as the former has not recovered yet. Despite Nanoha stating that she is fine, her colleagues suggest it is still not wise for her to be overexerting herself.

They get an alert from Amy Limietta that the reaction they detected is now moving...straight towards Fate and Hayate. A Crack manifests in front of the two girls, expanding itself pulling them into a vacuum. Fate summons Bardiche and tries to anchor herself to the ground catching Hayte from being sucked in. The Crack does not let up and increases its pressure to absorb them. To Fate's shock the anomaly even begins sucking her magical energy. Nanoha comes from the air intent on rescuing the two, despite the warning of Fate and Hayate. Flying head first towards the Crack, Nanoha attempts to use Raising Heart but the Cracks succeeds in pulling all three girls in before it vanishes. Chrono and Amy on the other end of the line realize their space-time distortion has vanished. Chrono even suspects that the phenomenon was targeting those three and immediately orders Amy to contact headquarters and the Ursula in order to launch an investigation of where the trio may have gone to.

While the disappearance of the three magical girl caused turmoil for the Tokyo branch of the Time-Space Administrative Bureau led by Chrono, elsewhere taking place in the Great Tomb of Nazarick, Momonga and Demiurge are preparing for a regular summoning experiment in the Throne Room. As they work Momonga is also given a report by Demiurge. It seems that the damages by Chaos Beasts are increasing in the Baharuth Empire. Due to a phenomenon, sporadic hordes of Chaos Beasts are arriving from the central part of the continent and migrating into the territory of the Empire. The information comes as a surprise to Momonga who has been focusing all his attention on E-Rantel since it is the center of all his field operations. Demiurge reports that Nazarick has not been able to deal with the hordes and so the damages to various part of the Empire is increasing rapidly. This is odd to Momonga as he heard that during the early days of the Incident caused by the Cracks, the Empire and the Slane Theocracy were quick to deal with the threats and established a system to deal with the monsters. Unfortunately the lapse in the defenses of the Empire is from the losses of the Imperial Army caused by Jaldabaoth. Not only that the Empire lost many warriors putting down that irregular Chaos Beast horde that attacked E-Rantel. The Floor Guardian adds that the Empire sacrificed much to preserve the key point of the Tripartite Agreement but the end result has left them weak. Not only in numbers but the army now is dealing with emotional trauma from the defeat of the Four Imperial Knights by the Demon Emperor.

Given the magnitude of the problem, Demiurge suggest that the protagonist address it to the emperor so earn his favor. While cause of the Empire's military decline was the result of the schemes of the Sorcerer Kingdom, creating a powder keg that is waiting to happen, Momonga decides to leave the issue alone. At present they have not encountered an individual they cannot handle, though they still have many questions on the Chaos Beasts. The emperor is already has an obsession with the protagonist and Momonga has no wish to burden the latter.

The two are then informed by a Death Knight that the preparations for the experiment are ready. Master and subordinate ready for the new summoning using the Chaos Stones with hopes to summoning a new batch of beings to Nazarick to help in its defense. Though noted such rituals also bring about "exceptions" such as beings from other worlds with valuable information. The experiment is initiated and soon enough Fate, Hayate and Nanoha emerge from the Crack. Once the three girls get their bearings, Raising Heart warns them that they should be careful. Nanoha confused by her Intelligent Device's warning soon sees what she was talking about when she notices the undead summons as well as Momonga and Demiurge. The three are initially shocked by their surroundings and the undead. Momonga seeing them to be just children uses [Mana Essence] and note that they have considerable mana power as well as talking weapons. Feeling guilty for dragging such youngsters to his home and to prevent them from panicking and making the situation turn ugly the Overlord approaches them in peace. The three magical girls are shocked at Momonga, being a talking skeleton but listen to the undead who offers to open a dialogue understanding if they are suspicious and refuse. Unexpectedly, Nanoha accepts to talk first to the surprise of her comrades and Momonga. Nanoha points out to her friends that there is no harm in having a conversation. Fate as well as Bardiche seeing that they are unable to re-establish contact with Chrono agree. Momonga is off put by their willingness to trust him, seeing that he underestimated the three being so young as they value the importance of information. Nanoha introduces herself to Momonga and her comrades and provided him with information of how they arrived.

Nanoha and her friends in turn learn from Momonga about the random summoning from different worlds through the Crack. Fate realizes that they may be on an "non-management world". This is bad as if this is an unknown world that the Time-Space Administrative Bureau is not aware of the rescue may take some time. Likewise from what the girls told Momonga, is is equally intrigued by their magic, Intelligent Devices and the Time-Space Administrative Bureau. Despite the prospects of rescue being slim, Nanoha remains optimistic that they can find a way to return to their original world which her friend share. This comes a bit of a surprise to Momonga given the reality of the situation that the three can maintain a positive and constructive attitude. In fact to him it makes the three appear to be emotionally mature far beyond their age. He envies people that are able to compartmentalize their emotions as he feels that he lacks that quality. Though he hopes to overcome that challenge with time.

Now that both groups have shared what they know so, Momonga wishes to learn more about the girls organization and its technology that allows them to cross dimensions. In exchange he is prepared to offer them the protection of Nazarick while they wait for possible retrieval. The offer is accepted by Nanoha and the others who also accept to do some work for Momonga such as fighting against some threats. On that note, Hayate inquires if such tasks be left to her and Fate as Nanoha still needs to recover from her injury that happened sometime ago. While the request is not unreasonable, Momonga suspects that the three wish to keep Nanoha out to hide their strongest card, but since he can't force them he will allow it. Nanoha insists that she is able to fight and allays her friends fear for her condition. Reluctantly the Fate and Hayate consent to Nanoha's determination. Impressed by their bond, Momonga thanks them for their acceptance. Upon hearing from Nanoha that her magic may not properly work, the Overlord directs her to his subordinates with healing magic to attend to her. After that he sends the trio to rest in their temporary quarters.

Later the next day on the 6th Floor, the three visitors assemble for their first job. Nanoha condition has drastically improved thanks to Pestonya Shortcake Wanko's healing magic to the disbelief of her friends. Aura Bella Fiora and Mare Bello Fiore arrive and introduce themselves to the magical girls and their Intelligent Devices. Fate greeting them is initially confused by their genders since Mare is wearing a girl's outfit. But once finding that it is normal for them, the girl assumes it to be just a cultural thing. Aura and Mare having heard of the Administrative Bureau deals in interdimensional traveling, have thoughts about possibly locating their creator Bukubukuchagama. But they turn their focus back on their charges to prepare them for today's task. They are soon joined by CZ2128 Delta who Aura then introduces to the magical girls. The three magical girls and their Intelligent Devices give the Pleiades member a warm welcome but they are met by a silent response which Aura explains that is due to CZ's personality. For the trio's first mission, Aura directs them to eliminate the Chaos Beasts on the floor.

During the culling of the Chaos Beasts, Fate, Nanoha and Hayate attack and destroy the Chaos Beasts from the air using attacks such as Axel Shooter, Photon Lancer, and Claíomh Solais. The synchronicity and magical attacks impress the members of Nazarick making some realize that Momonga was right to be cautious of them. Even CZ breaks her stoic attitude to acknowledge the hard work of the three girls. The Automaton takes a liking to Nanoha especially due to her cuteness and presents her a One-Yen Sticker. The gift is a surprise by Nanoha though her comrade Hayate and Fate find it amusing and wonder if they same would happen if Zafira, Vita, Reinforce Zwei, Alph, Arisa Bunnings, Suzuka Tsukimura, Yuuno Scrya, or Stella Irvine were present.

Watching the peaceful atmosphere from afar in the Round Table Room are Albedo, Momonga and Demiurge. The three are pleased with the results of the battle and that Aura, Mare and CZ have diminished the alertness of their guests. Both Albedo and Demiurge think that Momonga's motion to befriend the visitors would make them easier to control than using torture. Of course Momonga never had any nefarious intentions for the visitors as he truly wanted to befriend them and privately laments that many of his subordinates have such a low opinions on humans. Plus interaction with the trio provide to be beneficial for Aura and Mare is good for their emotional development. Still the abilities of the guests requires them to remain vigilant. According to Cocytus who reviewed videos of their fight Fate and Hayate mobility did well in short and medium ranged battles but Nanoha possess destructive capabilities at long range. Such power is explained to them through a Unison Device. The trio's power is concerning but Momonga is more troubled by the Time-Space Administrative Bureau since it is an armed military force capable of crossing to different worlds. Albedo informs her master that from what she gathered, the Administrative Bureau maintains a policy to not interfere with world that lack the ability to cross dimensions. On that note, Momonga believes it would be prudent to move some of the World Items, and the 8th Floor Hierarchy and Rubedo. But so far there is no hostility between them and the Administrative Bureau so the best option would be to establish a friendly relationship. For the girls, Momonga is interested in seeing them perform in aerial combat. The idea is agreed by Albedo and Demiurge who make plans to prepare the Pleiades to escort as well as interact with the guests outside using magical flying gear. There are some thought of concern to Nanhoa's condition but prioritizes to measure trio's combat ability and learn as much about their Intelligent Devices.

In the air near the Azerlisia Mountains, Nanoha, Fate and Hayate are flying marveling at the natural scenery commenting that the clear air data would be useful for Amitie_Florian for planetary regeneration for the planet Eltria. Whilst the Intelligent Devices record the data, Nanoha is curious about the native life outside the dungeon thinking that there should be many people. CZ flying beside her answers her that there are indeed other nations but their development is not at the level of environmental destruction. Also she adds that Nazarick has few humans within its hallowed halls. Nanoha recalling that there are other humanoid creatures similar to humans such Automatons and Dark Elves. CZ warns the girl that some people in Nazarick detest humans and should be careful, especially with their escort Narberal Gamma. Nearby Narberal states that it is not a problem, but Yuri Alpha watching with them notices that Narberal is putting a face like the normally stoic CZ and the presence of the humans is truly disgusting her. Yuri ignoring her sister's discontent advises the magical girls to come to her if they have any problems. So far the trio find that they are enjoying their time in Nazarick, with the luxurious room, food and medical treatment. Right now they only wish to give back for all the hospitality they have been given.

Yuri is pleased to hear that from her guests and then informs the girls of their primary mission: to eliminate flying Chaos Beasts in the vicinity. Since they are troublesome foes, the maid asks the girls not to overdo themselves. Raising Heart reports that unknowns are approaching them in the air. They turn out to be Chaos Beasts shadowing a Giant Flying Chaos Beast. The magical girls and maids then take to combat to eliminate the minor Chaos Beasts. The boss of the monsters seeing its minions effortlessly killed attempts to flee but the magical girl give chase and destroy it. With the monsters deaths, the party then collect the Chaos Stones from the dead Chaos Beasts.

Nanoha from the air then notices that there are injured people below them and inquires who they are. Yuri taking a look tells the girl that they are most likely workers from the Empire seeking to hunt Chaos Beasts and may have gotten into a scuffle with them. Since the Empire is declining, the nation must rely on the strength of workers rather than its own military. Nanoha finds it a pity that the people of the Empire fight so hard, though Yuri tells her that the state of the Empire is only temporary and that only soldiers and workers will be affected. Plus the leader of the Empire is more than capable of replenishing his army in due time. And claims that Nazarick has not yet revealed its existence to the world and thus remains neutral to the domestic affairs of the other countries. Nanoha obviously has more questions, but Fate eases her to hold her questions for the time being. The group then decides to return to Nazarick.

At the Round Table, after receiving the report of the battle Momonga who had been viewing it from the Mirror of Remote Viewing found the sight to beyond his imagination. Albedo admits that the aerial speed displayed by the girls were difficult to follow. Momonga believes that it may be troublesome if their guests may try to escape without additional support. He also notes that Nanoha will be persuaded to be kept in Nazarick, under the pretense of rest and recuperation. While he keeps her busy, he directs Albedo to find a way to get as much useful information from the other girls, starting with Fate who will be sent out into the field alone on a mission.

The next day, in at skies above the mountains, Fate was flying with Narberal and CZ to deal with more Chaos Beasts in the area. The three are in awkward silence as they travel and Fate thinking she should initiate a conversation starts by asking Narberal about her specialization in lighting magic. When she gets a short response that seemingly ends the conversation, Fate worries she may have offended the maid, but CZ quickly explains that her sister just prefers brisk answers and encourages her to continue the dialogue. The topic then draws toward Fate asking more about Momonga who she believes despite his fearsome appearance is actually a really kind person as he welcomed her friends into his dwelling. Touched by her words, Narberal in a rare act of kindness thanks the girl for praising her master. The maids then add that Momonga is extremely important to them as he was the only Supreme Being to remain with them until the end. Upon hearing this Fate is confused by the unfamiliar terms and both maids restrain themselves from adding anything else. TO distract Fate, Narberal then directs her attention to their approaching destination on the surface of the ground.

There the three women then defeat some Chaos Beasts with ease. CZ though senses that Narberal and Fate have become depressed, Narberal being sadden about thinking about her creator whilst Fate guilty for bringing the subject up. Narberal makes an effort to let Fate know that she should not feel bad for dredging up sad memories as it should not worry her. And while she does feel some longing to see her creator, she treasures the memory just as much. Fate can relate to this with her relationship with her friends Hayate and Alph. CZ watches and is amazed that Narberal is favorable towards the magical girl in contrast with her usually demeanor. The group then decided to return to the dungeon with the mission over.

Elsewhere at the same time, Hayate Yagami is flying with Yuri Alpha, Entoma Vasilissa Zeta and Lupusregina Beta. The four women are having a casual chat on snacks. When Entoma begins to describe her favorite snacks, Yuri warns Hayate to divert her ears as her younger sister's taste as a bit lively. The interplay between the maids reminds Hayte of her platonic bond she has with Rein and Vita who she sees as her younger sisters which Yuri relates to with her own sisters. After chatting the maids and magical girl then land to take care of some Chaos Beasts. Though the job is finished Hayate is absentmindedly thinking about her little sister Rein. Her teammates try to encourage Hayate to have fun and that the day would come that she would see her family again. Their words cheer Hayet up who appreciates the maids for their support. They group is soon joined by Fate's group who together return back to Nazarick.

Meanwhile in the Guest Room, Demiurge is conducting an interview with Nanoha and Raising Heart on all the technology and science from their world.

Aftermath
TBA