Tomiko falls in love with Niitaka, even though she also suspects him of being the Tokyo bus driver serial killer, who killed his female conductors after tiring of them.
Benkei, a master fighter and killer, vows never to take another life after his conversion to Buddhism. His faith in pacifism, however, is shaken and ultimately broken by the attacks from a trio of fighters known only as the demons. Taking up his sword once more, he sets out to end their murderous terror.