Onwa and his wife return to their husband’s parents’ house in Tokyo. His brother-in-law, Yusuke, who is busy taking care of his father, Shigeo, who is living a life without women, has been fascinated by Reiko’s sex appeal. Yusuke sniffs the smell of Reiko’s underwear that has been taken off in the undressing basket. The female odor emanating from a mature woman’s body destroys Yusuke’s reason and awakens his reproductive instincts. The indecent smell of brothers-in-law, who are covered in each other’s sweat and body fluids and violently intersect, permeates deep into the tatami mats.