Nanako's stepson commits an assault. Believing that it was her fault that her son rebelled, having remarried during the unstable period of his adolescence, Nanako begs the teacher who came to interview her, "I'll do anything, just don't expel him." As if he had been waiting for her words, the teacher demands Nanako's body. Although Nanako reluctantly complies, she refuses to cross the final line, but her son's bad friend witnesses their affair and uses it to blackmail her...