The Seven Deadly Sins and the Ruler of Death

The Seven Deadly Sins and the Ruler of Death (〈七つの大罪〉と死の支配者) is a collaboration game event in Mass for the Dead with characters from Overlord and The Seven Deadly Sins. It was released on October 1, 2022 to October 15, 2022.

Background
A guest from another world has been recently summoned to the Throne Room. The boy, who calls himself Meliodas, who is not as old as he looks. While being cautious of the mighty magical power hidden in his body, Momonga decides to cooperate in the search for a girl named Elizabeth――

Incident
After a long battle the Seven Deadly Sins go their separate ways. For its captain, Meliodas and Elizabeth the third princess of the Kingdom of Liones, the couple decided that before succeeding the current King Bartra and become the new king and queen, they will first travel around Britannia for their honeymoon to visit the lands of their memories. The couple are in town making preparations browsing through the shops on the streets. Elizabeth before leaving the next day, plans to see her father before heading out with her husband. She feels it is almost unreal that they have reached this point in their lives, wishing to have new memories that they can reflect on after they return from their trip. Meliodas hopes that as long as the peace hold up, then they will not have to make their children fight. This bring to mind about King and Diane children. As Elizabeth ponders, a Crack appears behind her, pulling her through to Meliodas's shock who soon follows after her. The Crack after sucking its victims in, quickly vanishes, its brief emergence unnoticed by the merchants and shoppers, nor realize that it absconded with the royal couple.

In the Throne Room of the Great Tomb of Nazarick, a new summoning experiment is about to be conducted using a Chaos Stone. Momonga who is present calmly observes the Crack embedded in the ground contemplating on the Sea of Possibilities that lies beyond the spatial phenomena. His ruminations are brought back to reality when Demiurge reports that preparations are complete. Noticing his master's interest in the Crack, the Floor Guardian inquires if there is any concern. Momonga merely replies he was thinking about the power on the other side which Demiurge knows its something that can turn ideas into reality and also the cause of many several incidents that plagued Nazarick. Not only that various entities have emerged from the Crack, though are only subordinates to whatever reigns in the Sea of Possibilities. Demiurge cites Shiro to be one such existence, however while the boy claimed to be born from the Sea of Possibilities, his true identity is still unclear as is the nature of the Crack. Hence why they have enacted a new summoning experiment to hopefully extract new information in spite of the dangers.

The experiment is initiated and the Crack glows bringing out Meliodas, landing lightly to the floor who warily. Momonga observing the scene sees that experiment has once again brought an exception into the world, though is surprised that only one person came through. Meliodas then demands then to answer two question. One if they are responsible for summoning him. Momonga clarifies that it was the work of the Crack that brought the boy, though admits that they may have triggered the phenomena. The second question is where is Elizabeth? Momonga cannot answer Meliodas as the boy was the only one that came through the Crack, but offers to help find her for the visitor. After a few tense seconds, Meliodas casually accepts relieved that there is no need to quarrel. This is a bit unexpected as Momonga did not expect the human to take his word at face value. To the contrary, the human doesn't completely trust the undead, but going by logic, if Elizabeth was not being held captive by him, then there would be no need to offer aid. Meliodas introduces himself, giving his title as Captain of the Seven Deadly Sins and owner of the Boar Hat. Likewise Momonga gives his name and introduces him to his domain, before diving into negotiations.

Once the two exchange information about the current situation and their respective worlds, Meliodas is still unsure of where he is as he feels that he is not in the Demon Realm or Celestial Realm. Momonga's appearance while not appearing as a denizen from the Demon Clan causes Meliodas to stay on guard as he while he can't sense sense any magical power from Momonga he feels he is similar to a demon. And based on Momonga's title as Sorcerer King and a Overlord, Meliodas deduces that his host has the traits of someone that "brings death and fear."

On the other hand, Momonga learning from his guest that he originates from a land called Britannia recollects that Round Table Room once mentioned a place with a similar name. Though from the account of Meliodas, it seems that this Britannia is a different Earth where magic exists. He is more concerned about Meliodas as from using [Mana Essence] he can tell that the boy is pretty powerful and that hostility should be avoided. Thus he prioritizes acquiring any new knowledge or technology Meliodas might have, and is glad that right now he knows what his guest seeks. Under the pretense of accidentally summoning Meliodas and his wife, Momonga offers to provide Nazarick's full cooperation. But asks if Meliodas goes outside the tomb, that he be escorted. From this Meliodas accurately guesses that the Great Tomb of Nazarick is a hidden existence to the rest of the world, hence why Momonga wants to monitor him to prevent him from divulging the tomb's location. The Captain of the Seven Sins is fine with that constraint as he admits that he isn't sure he can shake off Momonga's spies and plus he needs a guide. Before going into negotiations for technology exchange, Meliodas asks how can Momonga be sure if Elizabeth is currently in this world. He is then told that there had been other precedents where guests being swallowed by the Crack are either summoned from the Throne Room or in another part of the world. That in mind, Meliodas will put his faith in Momonga for now giving off a smile to the undead. The smile though does little to allay Momonga as even though Meliodas appears as a child, something nags at the Overlord of the boy being a bit off and warns himself not to let his guard down. Still he resolves himself to make concessions to Meliodas by looking for Elizabeth to remain on his guest's good side. Thus, Meliodas, although it was unusual for a guest from another world, without going through a screening process, was immediately allowed to go outside the tomb.

Outside the mausoleum, Aura Bella Fiora and Mare Bello Fiore introduce themselves to Meliodas as his guides/escorts.

Aftermath
TBA