Shinobu is a blind young man who lives a peaceful life thanks to the support of his dedicated teacher and girlfriend, Mikoto. Each day, he puts all of his effort into mastering the ancient martial art of "Mibuchi Toshujutsu" to keep himself safe. However, everything changes when a stranger assaults their dojo, overpowering both Shinobu and his teacher before abducting Mikoto. Overcome with grief and hopelessness, Shinobu eventually resolves to retrieve her at any cost. He sets off for a remote island prison where the most dangerous criminals are held, where he'll have to participate in a life-or-death battle against these merciless men in order to save Mikoto.
