The story centers on D.P. (Danger Planet), an intranet-based online game played via a V.P. (Virtual Puppet). A VP serves as a literal avatar for a player within the game. However, unlike characters in contemporary online games, a VP can be modified by a user, provided they possess adequate programming skills. Kirio Nimura is an ordinary high school student with a fondness for games. He and his friend Kurata regularly play Danger Planet after school, until one day they encounter a formidable opponent.