Während des Zweiten Weltkriegs überlässt der Manager des Culver Hotel seinem Neffen für ein Wochenende die Leitung des Hotels. Der junge Mann nicht träge, benennt das Haus erstmal in "Hotel Rainbow" um und überbucht es mit Adeligen, Mördern, Geheimagenten, Japanern und anderen...
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.
