A tiger-masked teenager gets possessed by his evil dimension doppelganger and the only thing standing between your world and total conquest is whatever insanity his body can throw at the Dark Realm's minions. The plot doesn't make sense and it doesn't care, because every frame is animated like someone spent their entire animation budget on movement instead of story coherence. This is 1987 OVA maximalism: relentless, violent, visually inventive, and designed to exhaust you before you finish asking what's actually happening.

Riki Hyoudo is a kung fu fighter who likes to wear a tiger mask, which makes him fit right in at Battle Royal High School. The problem: he is the doppelganger in our world of Byoudo, Master of the Dark Realm. When a gate opens between the two worlds, the evil Fairy Master tricks Byoudo into trying to conquer Earth, and Riki ends up semi-possessed by his otherworldly double. Meanwhile, the Fairy Master's minions are mutating Riki's classmates into grotesque, lustful monsters. All the dimensional upheaval draws the attention of a sword-wielding exorcist and of Zankan, a hero of the Space-Time Police. Facing enemies from both Earth and the Dark Realm, Riki has to rely on new powers that put his humanity at risk. The 1987 OVA mixes action, ecchi, horror and the supernatural.