Kai, a high school student, drifts through life, uncertain of his purpose. Trapped in a city torn apart by violent gang wars, he discovers he possesses a rare supernatural ability—the power to enhance any part of his body for a limited time. But just as he begins to understand his gift, he learns a cruel truth: he has a terminal illness, with only three years left to live.

Struggling between hopelessness and survival, Akari is pulled into the deadly underworld, where every fight pushes him closer to the truth behind his powers and the forces manipulating the city. As he fights to stay alive, he wrestles with an even greater battle—finding meaning in a life that is slipping away.