Tamura Masakazu returns as Nemuri Kyoshiro for the fourth and final time. Gensai, an eccentric Ukiyoe artist, urgently requests Kyoshiro to kill his wife. He believes that the moment she is killed will represent the ultimate state of beauty, and wishes to see Kyoshiro's signature “Engetsu Sappo” (“Full Moon Cut”) killing technique for the purpose. But this unusual request comes not only from Gensai, but also his wife, Orin, who has a tie to Kyoshiro's past. Meanwhile, Tenzen wants to hire Kyoshiro as their master sword instructor for the Kurume Clan, whose lord has an unhealthy obsession with Kyoshiro and his Engetsu Sappo…