Kaori, a married woman who has lost patience with her husband who is so busy with work that he neglects his family, is venting her frustrations by cheating on him with his ex-boyfriend. Meanwhile, her relationship with her daughter, Saki, is going well, and on the surface they live a peaceful family life. But the breakup comes suddenly. Her daughter's boyfriend, Ippei, finds out about their affair and demands sex as payment for keeping it a secret. Not wanting her husband or daughter to know, Kaori does whatever Ippei tells her to do. From that day on, she begins a life of humiliation as she is toyed with while being tormented by guilt towards her daughter...