Dyed White and New Year's Ruler

Dyed White and New Year's Ruler (染まりし白と正月の支配者) is a game event in Mass for the Dead that was released on January 1, 2023 to January 15, 2023.

Background
King Shiramochi-ō, the Ruler of New Year who was once welcomed by Nazarick. His incarnation Shiro revives and announces the arrival of a new New Year.

At the same time, a dangerous situation occurs where mental effects take effect, Momonga and Shiro set out to intervene, but...?

Incident
The scene takes place in the peculiar serene Chaos Zone, where several members of Nazarick, such as Albedo, Slimeko and Shalltear Bloodfallen are wearing yukatas and a qipao. For Narberal Gamma and Lupusregina Beta they are respectively dressed in a shrine maid dress and attire resembling the Monkey King. Also present are Pandora's Actor, Cocytus, Momonga, Demiurge, Shiro, Entoma Vasilissa Zeta, and Yuri Alpha. All bow wishing a "Happy New Year" and continued support.

Momonga directs his attention to his guest Shiro on his finds the festive atmosphere. Shiro gaining power through the joyous mood admits that it is good. On cue he the Takemikazuchi Shrine appears. Cocytus seeing is interested in the structure, which is understandable to Shiro as it is inspired by his creator Warrior Takemikazuchi. Shiro announces that the shrine will serve as the setting place for New Year's Day in Nazarick.

In the past when New Year's Day approached, it would be regarded in dread, but now thanks to Shiro's aid the NPCs in Nazarick can finally enjoy the holiday without fear.

To explain the event that is now transpiring, a flashback occurs. Some time ago in the past in Momonga's office, Pandora's Actor finishes a report to Albedo, Demiurge and Momonga on the management of the Treasury. From his report, the various mining of resources have stabilized as well as the earnings of foreign currency show an uptrend. Both Albedo and Demiurge attributes the increased profits to Momonga's idol plan. After ending the discussion, Momonga receives a knock at his door to which Aura and Mare enter, followed by an unexpected visitor: Shiro.

Shiro greets Momonga as it has been a year since their last meeting. Momonga is delighted to see Shiro once again. The rest of Momonga's subordinates greet Shiro, having retained their memories of Shiro's existence in his last visit. Albedo in particular had set up a space for Shiro as an honored guest in a corner of the village on the 6th Floor, while Demiurge had maintained an interest in Shiro due to being a intelligent being from the Sea of Possibilities and was seen as a precious source of information.

Pandora's Actor though is more wary of Shiro as the boy is the incarnation and ruler of New Year. Even though Shiro is a guest, Pandora's Actor having remembered that Shiro attacked Nazarick in his "White Mochi King" aspect worries about the New Year's epidemic that usually occurs with his arrival. Shiro though reassures that will not happen this time. As evidence Shiro shows himself that he has literally "thinned" up for some time thus his powers have weaken. Aura studying Shiro admits that he seems to be more diminished somewhat, compared to how she last saw him. Mare is worried as this could mean that Shiro's existence is fading. To Momonga this confirms what he already knew from the twins' reports of Shiro's condition while the Ruler of New Year was staying isolated on the 6th Floor. While Shiro still does not know the cause of the Cracks, the boy is still regarded as a valuable source of information and Momonga would like to maintain a friendly relationship with the entity.

Since Shiro is now out and about, it signifies New Year is approaching. Shiro confirms this and wanted to warn that there would be a possibility that a new "White Mochi King" could arrive through the Crack from the Sea of Possibilities and assist them in intercepting the possible attack.

Momonga is grateful for any aid Shiro can provide. In regards to countermeasures, Demiurge deduces that from his analysis of the previous "White Mochi King", a "ceremony of celebration" that Nazarick performs is equivalent to a summoning ritual that brings for the alien entity. Given that their opponent is a formidable enemy, Demiurge asks his liege how they they should respond in kind as previously? Albedo seconds that proposal in order to handle the event with greater care as it is not just a time of attack but also when Nazarick can unite in a common goal.

Shiro recalls that last year, the mental effect that usually took over the inhabitants of Nazarick, was absent or in that they were not affected. From this he hypothesizes that perhaps celebrating New Year's willingly before the "White Mochi King's" attack made them immune. While cannot confirm that this idea is the truth, it is regarded as logically by Demiurge as it aligns with his theory. Not only that Shiro adds that when New Year's is at its peak, he grows stronger, hence in order for him to be of use, they will need to celebrate New Year's Day in Nazarick.

Pandora's Actor finds this situation to be contradictory as they are planning to halt an invasion of a new Ruler of New Year's whilst helping to strengthening the old one. Momonga admits that it is worrisome as there is concern that the Floor Guardians could turn to the enemy side should the mind control effect happen. Demiurge believes that they should proceed as the benefits outweighs the risk. Even if the power of the White Mochi King grows stronger as a result of the New Year's celebration, Nazarick should not be dissuade to enjoy the holiday themselves. Momonga finding hard to argues is about to agree, when a [Message] comes in for him from Narberal Gamma.

The Pleiades alerts him that she is present with Shalltear Bloodfallen in the restored Throne Room, reporting that they just finished a Chaos Beast subjugation. But the state of the Crack is showing signs of new activity, releasing a cloud of miasma. Shalltear over the magical transmission, begs Momonga to come and see for himself. Momonga and his allies t hen tried to move as fast as they could to the Throne Room, but as they were traveling their, the Crack in the area had already begun to glow, an ominous sign heralding something was coming.

The group hurries past the ruined Lemegeton, and into the Throne Room. As the women reported over the [Message] the chamber is filled with miasma. Momonga observing the scene notes that no Chaos Beasts have appeared yet despite the activity from the Crack. That changes when Shiro alerts everyone that something is crossing over. A Kadomatsu Type Beast appears with aggressive intent. Momonga curious of how his subordinates perceive the entity, does a roll call. All NPCs in the chamber report that it appears to be just a Chaos Beast with a slight weird aura. This confirms to Momonga that none are being influenced by the mental effect. In the past, New Year theme monsters usually are accompanied by a mental field that causes those who encounter them to be seen as harmless, but it appears that the impact now has weaken. While this could be true Momonga does not discount the idea that perhaps the NPCs have developed an immunity or are more guarded than before.

Shiro seeing that he possibly may have caused another New Year's invasion attempts to apologize, but is asked by Momonga to save it at least until the subjugation is done. The hostile summon is quickly cut done by the group. Afterwards everyone confirms that none are hurt. Frankly some like Narberal view the enemy to be not so much different from a normal Chaos Beast. Unlike the past where those under the mental effect were in a state of bliss, Shiro surmises that it may be less effective on people who have a desire to celebrate New Year's. Momonga believes that could be true and that reason for their immunity to the effects could be that the Chaos Beast subjugation probably fell into the category of an activity before New Year's as "general cleaning". It this seems that those who follow in the practices of New Year's are not affected by the mental effect.

This information is valuable as now they can better prepare for future New Year events. Narberal mentions that prior to the subjugation, she having just returned to the dungeon, out of serendipity was invited by Shalltear to join in the session which led to this unexpected discovery. Though the mental effect has been confirmed to be mild for them, Momonga decides to check on other areas statuses. While Aura and Mare are headed to the 6th Floor to check the its state, Momonga contacts Entoma for a report on the 1st Floor.

At the 1st Floor Entoma with Yuri Alpha are now dressed in yukatas and greet their master over the transmission with an early "Happy New Year". The duo inform their master that a tori has appeared and that they are on their way to cross through it. To Momonga this is not unexpected and allows the maids to have fun with the 'festivities'. Albedo asks if this is wise as it is obvious that the two maids are no compromised by the New Year's effect. Momonga thinks that it would be less dangerous to allow things to proceed, as forcibly detaining those affected would lead to unforeseen danger. The tori that Entoma and Yuri mention is a gateway to an area where the White Mochi King appears. Said area is actually Fake Nazarick that has been changed to suit the New Year event. On this Momonga inquires Shiro on how long will it take for the White Mochi King to appear after the area has been converted.

Shiro does not know, only that once all the key event items, the Lucky Items, are found then the boss will appear. However these items so far have yet to be dropped throughout Nazraick, so Momonga believes this New Year might be slightly different. He then decides to focus on preparing for an attack by the White Mochi King and asks Albedo who is currently active outside of Nazarick. He is given the answer that several summons as well as Solution Epsilon, Lupusregina Beta, CZ2128 Delta, and Sebas Tian are out in the field. Besides them there is also the protagonist and Slimeko. The Overlord orders them all to be recalled and reconvene at the 6th Floor and directs his followers to confirm the situation in Nazarick.

The next destination turns out to the bustling Canteen, where Pestonya Shortcake Wanko and the Homunculus Maids greet Momonga with a "Happy New Year." Momonga notices that the maids are busy. Pestonoya confirms this as they are being directed by the Head Chef to hurry and prepare New Year dishes. Cixous and Foire apologize if it all seems rushed as they suddenly felt that New Year's was approaching and that they were compelled to make preparations of the event. Not wanting to dash their spirits, Momonga forgives them and asks that they do not push themselves and to enjoy the holiday.

In the hallways of the 9th Floor, Albedo and Demiurge walk together with Momonga to discuss the state of the 9th Floor under the effect of the New Year's mood. Aside from the maids who have been bewitched by the mental effect, the casino and bar on the 9th Floor are also seen closed. The trio then check the Round Table Room where to the shock find Pandora's Actor and Cocytus lounges underneath the Round Table which has been turned into a kotatsu. Demiurge is aghast at the scence, and even more so when Momonga tells him that he and Albedo acted like this when they were under the mental effect of New Year's.

Albedo annoyed by the carefree attitude of Pandora' Actor and Cocytus quickly snaps them back to attention, berating them for such a display before their master. Seeing how strong such a mental influence is, even to affect a serious character like Cocytus, makes Demiurge a little afraid that the phenomena was a yearly occurrence. Momonga though is confused as why Pandora's Actor is under the mental influence, as the Area Guardian was aware of the dangers just a few moments ago. Turns out Pandora's Actor was not under the New Year's mood, but was so engrossed in a discussion with Cocytus he just allowed himself to curl beside the kotatsu. More angered at this, Albedo demands what could have caught his attention to ignore their master in the room. When Pandora's Actor reveals they were speaking on the topic of heirs, it piques Albedo and Shalltear's interest.

Pandor's Actor explains that he and Cocytus were talking about what they would do when a heir of Momonga is produced and testing the possibilities. For Cocytus he wishes to become their swordsmanship instructor, while Pandora's Actor would like to be seen as an older brother. Hearing this Momonga is relieved as Shiro confirms that the Area Guardian is not under the mental effect, though he notices that Momonga appears to be taking a different tone. Momonga though says not to worry. Demiurge openly realizes that psychoactive effect has become innocuous at this point that it is difficult to tell. Shiro is stunned that they can be so calm with such new discoveries with the crisis at hand.

Albedo calls up the topic of the otoshidama tradition on New Year's, when thinking about children. This track of conversation leads two both Shalltear and ALbedo arguing on which features of their's would be best suited for Momonga's child. The argument is quickly quelled by Momonga. Demiurge while he does not think the topic of a heir is unimportant agrees that they need to prioritize the anomalous situation first.

On that Albedo suggests that all they need to do is "clean" Nazarick to snap everyone out of the mental effect. But Shiro and Momonga believe that they first need to prepare befire doing any mitigation for the current situation especially with the eventual confrontation with the White Mochi King. Shalltear believes that they do not have enough time and worries that even Aura and Mare could be affected by the mental effect even in a small degree. Most importantly she is concerned on the state of the Crack. Taking heed of her concern, Momonga then leads the group to the 6th Floor.

At the 6th Floor, Aura and Mare have defeated a Mochi Type Beast. After it is defeated, Mare asks his sister that maybe they should report to Momonga. Aura is of mind to think that more will come from the Crack on the 6th Floor. They are soon joined by the arrival of Momonga and his entourage who are greatly to see that the dark elves have handled the situation with ease. Upon learning that the monster was a Mochi Type Beast, Momonga inquires if any item drops where left like last time. Sadly the dark elves inform their master there were not causing Momong to be perturbed on the difference between now and the previous New Year's event.

Shiro is happy thatthe twins are fine as he embraces them. Aura remembering about the item drop Momonga was talking about the item such as the cane that he gave to Shiro the first time they met. Mare also recalls that around the same time they also found a fishing rod after he and Aura had a tossed around a hane together. Demiurge then recalls the report of the "shogatsu" being observed to Momonga. But before Momonga can respond, a [Message] comes in for him from Solution informing all the agents he recalled are present at the Amphitheater.

Momonga ends the call once he tells the maid that he and several others will meet them. To his followers he announces that his undead will monitor the Throne Room whilst they convene at the Amphitheater with their fellows to discuss about the current New Year's Day situation.

At the Amphitheater, the members: Solution, Lupusregina, Sebas, and CZ have arrived. There they learn from Momonga and his escorts of the mental effect overtaken Nazarick

Aftermath
TBA