Battle Royal High School

Riki Hyoudo is determined to rise as the ultimate fighter, and his journey begins with a challenge against his high school's formidable karate team. Clad in his distinctive leopard mask, Riki skillfully takes down each member, culminating in an intense showdown with the team captain, Baba. Just as he revels in his hard-won triumph, Riki is confronted with an unexpected twist: his prowess has drawn the attention of Byoudo, the Master of the Dark Realm.

Suddenly thrust into a perilous battle against a host of adversaries from both his world and beyond, Riki's existence spirals into turmoil. As he navigates this new and treacherous landscape, he must harness unfamiliar powers that threaten to compromise his very humanity, forcing him to confront the true cost of his ambitions.