Mikito Sakurai is tired of being a punching bag for all the delinquents on campus. But what can he do? By nature he's a gentle and easygoing high school student. That all changes the night he swallows a mysterious orb and meets Zakuro, a strange kid who promises to grant his most heartfelt desire. "When you wake up," says the pint-sized apparition, "you'll be stronger and better than a human."

And that's exactly what happens. Mikito wakes up with superstrength. But there's a catch. He may look the same on the outside, but deep inside lurks a monster that craves ultraviolence and the taste of human flesh. "I used to hate the sight of blood," says Mikito to himself, "but now it looks so beautiful to me."