In mid-19th century Edo period, a masterless rōnin named Mokunoshin Tsuzuki resides in a peaceful village among those he helps. However, as the prevalent peace and tranquility are sure to be replaced by war and conflict across the land, the swordsman feels restlessness creeping upon him.

Nurse Akane, who has a secret etch with the patient, participates in a confidential project to solve the problem of declining birthrate due to transfer to the research and development department.

Waking up in his apartment, a psychiatrist learns that he is being held captive by a patient and that one of the tortures inflicted upon him is the loss of his manhood. When he escapes with the help of his wife, his eventual recovery comes complete with a donor piece that greatly affects their lives together. Shortly afterward, he begins to experience strange visions of a woman he's never met, which begins to affect the relationship as he seeks out the girl behind the visions. When they begin a relationship together, it soon develops into another personal tragedy.