Battle Royal High School

Hyoudo Riki, a seemingly average student at Battle Royal High School, enjoys wearing a tiger mask while practicing Kung Fu. However, Riki is the doppelganger of Byoudo, a Master from the Dark Realm. When a dimensional gate opens, the Fairy Master tricks Byoudo into attempting to conquer Riki's world. Now, Riki is partially possessed, and his classmates are transforming into monstrous creatures. Adding to the chaos, a sword-wielding exorcist and the heroic Zankan of the Space-Time Police are drawn to the inter-dimensional conflict. Riki's survival becomes the ultimate test, a mid-term exam where the stakes are life and death, forcing him to confront his dark counterpart and the forces threatening his world.