In the year 2138, virtual reality gaming is booming. Yggdrasil, a popular online game is quietly shut down one day. However, one player named Momonga decides to not log out. Momonga is then transformed into the image of a skeleton as "the most powerful wizard." The world continues to change, with non-player characters (NPCs) beginning to feel emotion. Having no parents, friends, or place in society, this ordinary young man Momonga then strives to take over the new world the game has become.
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Momonga does damage control at the guild while he assesses the reason for Shalltear's revolt. Coming to the conclusion that she is under an incurable status effect, Momonga goes to the treasury to retrieve some of the powerful weapons of Nazarick.
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Though Shalltear's skill set puts Momonga at a complete disadvantage, he steps forward into battle. He gave various world items to his guardians to ensure the safety of Nazarick in his absence. Now, all that is left is a battle of life and death!
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Momonga reminds Shalltear that he is the master of Nazarick and that his name carries the weight of all the supreme beings of Ains Ooal Gown. After the battle comes to a close, Momonga quickly takes action to strengthen the defenses of Nazarick.