Koumei went out to buy some porn books with Kan'u's group waiting in the restaurant, hearing things about Kousonsan, swords, and the Chou sisters idols. A girl with pink hair is cornered by the trio bandits, with perverse thought about her. Kan'u's group come in time and with one swing, Kan'u sends the trio away (to the sky). The girl introduces herself as Ryūbi Gentoku, that surprises Kan'u and her friends. Ryūbi finds that there's an impostor claiming Ryūbi before, and she's aware of the man. Koumei tells the party about Kousonsan's sword and asks Ryūbi come to find about it. Ryūbi leaves the day after only to get herself attacked again, and once again, Kan'u's party saves her (then with Chouun as Kochou Kamen). Later, Ryūbi and Kan'u's party (except Bachou and Kouchuu with Riri) leaves Touka for Kousonsan's place.