Battle Royal High School

Riki Hyoudo's life at Battle Royal High School is disrupted when a dimensional gate opens, connecting his world to the Dark Realm. As the doppleganger of Byoudo, Master of the Dark Realm, Riki becomes semi-possessed, making him a target for the minions of the Fairy Master who are using dark magic to transform his classmates into monstrous creatures. Meanwhile, the appearance of an exorcist and Zankan from the Space-Time Police adds to the chaos as Riki must navigate this supernatural threat to survive.