The story is about Hazama, a poor and abused boy who goes to Karukozaka High School. In order to get vengeance on his peers, he performs a ceremony in the gym that transports his high school into Makai, the netherworld, where he has somehow become powerful enough to become the Demon God Emperor.

The story is about Hazama, a poor and abused boy who goes to Karukozaka High School. In order to get vengeance on his peers, he performs a ceremony in the gym that transports his high school into Makai, the netherworld, where he has somehow become powerful enough to become the Demon God Emperor.