In modern Tokyo, Kaito Ishikawa is a cocky, short-tempered street boxer struggling to keep his family afloat. When he unknowingly awakens a mysterious bloodline scroll, he gains access to ancient powers tied to eight extinct bloodlines—powers that let him see and fight monstrous Yōrei threatening humanity. Dragged into the shadowy Kamiyo Society, an elite and secretive academy where politics and power collide, Kaito must learn to control his newfound abilities while navigating brutal battles, dark secrets, and his own stubbornness. But unlocking his bloodline might just be the beginning of a war that could consume both worlds.