Nanako's son-in-law causes an accident. - Believing that it was her son's fault for remarrying during the unstable period of adolescence, Nanako begs the teacher who came to interview him, saying, ``I'll do anything, just get him expelled.'' - As if waiting for those words, the teacher demands Nanako's body. - Although Nanako reluctantly agrees, she refuses to cross the final line, but her son's bad friend has witnessed the two of them having an affair, and he uses this as a joke to blackmail her...