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After accidentally killing a government official’s son in a fight, Mugen and Jin are seized, and are sentenced for execution. Fuu successfully saves the two warriors, and hires them to accompany her during her search for a samurai “who smells of sunflowers” which may lead to her father.

The suspense horror/dark fantasy story is set in Tokyo, which is haunted by mysterious "ghouls" who are devouring humans. People are gripped by the fear of these ghouls whose identities are masked in mystery.