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Within the game exists a guild, Ainz Ooal Gown, originally consisting of 41 members and credited as one of the top strongest guilds. Now with only 4 of the members left remaining in the guild, the other 37 were said to have quit the game. Of those 4, Momonga, was the one guild member who continues to actively play YGGDRASIL as their guild leader. He spent most of his hours and money maintaining their headquarters, which is the Great Tomb of Nazarick they worked so hard together to design in the past.

During the final day where the game was about to almost reach its end, Momonga send out invitations to the remaining guild members who are still semi-active. However, among those that did come apart from Momonga, only one happens to appear and stay around with him for a short while before logging off. Though saddened by the fact that they had to part ways, he accepts the grim reality that his friends have real life situations to take care of above all. As the last remaining player in the guild who was online, Momonga decided to continue staying logged on for the remainder of the game's time left, choosing to sleep within the Throne Room until the server automatically boot him out.

After the game shuts down, Momonga awoke to find himself still in the form of his heteromorphic avatar, an Overlord who will later on become "the most powerful magic caster in the world." Within the Great Tomb of Nazarick, he was met with NPCs who are beginning to have a consciousness of their own. In other words, he was transported into an entirely different New World as its own reality along with the various NPCs in Nazarick who have been brought to life after the transfer. Realizing the state and situation he is in, Momonga tried his attempt in using player functions, such as the chat, a GM call, or even a forced logout, but none of them seem to be accessible at all anymore. With no other options left, Momonga considers the idea of setting out on a long-term quest to learn whether anyone from YGGDRASIL had been sent into this New World with him, refusing to believe that he was the only player transported.

Realizing what his next course of action will be: Having no parents, friends, or place in society, this ordinary young man, Momonga went outside the tomb to explore, investigate and conquer the vast unknown new world with the help of his subordinates from Nazarick. Along the way, he takes on the name of Ainz Ooal Gown as a sign of respect to not only represent his former guild members who aren't around, but to also sent a clear message to any other players out there besides himself. As a result, Momonga step foot outside Nazarick and begun his exploration of the surrounding lands and regions in an attempt to figure out what has been transpiring until now. He tried to search for anyone or anything that could help him unraveled the mystery of this world's magical norms and rules which sets it apart uniquely from YGGDRASIL. At the same time, while also ensuring the safety of Nazarick and its denizens first over those who he have managed to befriend with throughout his adventures in the New World.