Zhang Feng dies unexpectedly in the modern world and awakens as a reincarnator inside the Main God Space, a multiversal system that sends contractors into fictional worlds to disrupt fate and harvest energy. Rather than entering himself, Zhang Feng becomes an administrator who selects powerful natives as reincarnators. His first choice is Orochimaru, the legendary Sannin of the Naruto world, whom he rescues from death and implants into the system.

Orochimaru is immediately deployed to the One Piece world's Impel Down, where he must escape the underwater prison within ten hours using only his wits and ninjutsu. As Zhang Feng watches through the Main God's screen, he begins recruiting more protagonists from across anime and fiction, building a stable of reincarnators to farm reward points and unravel the secrets of the Main God Space itself.