At the wedding ceremony of heroine Nono Kawa husband Takeo, Takeo, who became acquainted with his brother, Sugiyama, became a frequent drinker. Sugiyama, who has come to drink Takoe's house without fail, is interested in the body of his sister, Nonoka. Sugiyama, who had been told that he had no sexual desire while looking at Takeo, visited the sister house in the daytime as an excuse for coverage and raped her sister. As a result of this work, Sugiyama threatens to inform her husband and requests the relationship several times with Nonoka. Nonoka who was a complaint of desire gradually falls to his brother Sugiyama and visits his sister's house ...