Mikito Sakurai is weary of serving as a punching bag for every delinquent on campus. Yet, what options does he have? He is, by nature, a gentle and easygoing high school student. Everything shifts the night he swallows a mysterious orb and encounters Zakuro, a peculiar child who pledges to fulfill his deepest desire. "When you wake up," the pint-sized apparition states, "you'll be stronger and better than a human." And that is precisely what occurs. Mikito awakens with superstrength. However, there is a catch. While he may appear unchanged externally, a monster lurks deep within, craving ultraviolence and the taste of human flesh. "I used to hate the sight of blood," Mikito tells himself, "but now it looks so beautiful to me."