The sixth year of Hōei. In the sixth year of the reign of Tokugawa Ienobu (Hiroyuki Mikawa), the sixth shogun, Kayo (Yumi Nakano), a maid in the O-oku (inner sanctum) of Edo Castle, was beaten. The incident is buried in the dark, and the closet where Kayo was beaten becomes an "unopened room. One day, after four years had passed, Echizen no Mori (Toshihiko Oda), on a hawking trip with Ienobu, presented Ienobu with a beautiful tattoo of Oma (Maya Kitami) on his back. Ienobu is overjoyed and becomes completely captivated by O-Man's body....