The year is 2138. The once massively successful VR online game Yggdrasil is about to come to an end its service. Player Momonga is alone in the guild where he and his friends had once enjoyed prosperity, quietly waiting for the time to come. However, the game does not log him out even after its end-time passes. The NPCs suddenly begin to have wills of their own. And outside the guild is a world that he has never seen before.