Nanako's stepson gets involved in an assault incident. Believing that her son went astray due to her remarriage during his unstable teenage years, Nanako pleads with the teacher who came for a meeting, 'I'll do anything, just please don't expel him.' The teacher had been waiting for these words and demands Nanako's body. Although she reluctantly agrees, Nanako refuses to cross the final line. However, their affair is witnessed by her son's delinquent friend, who then blackmails them with this information...
