Kyouko lives a peaceful life with her husband, Tadashi, and her son, Yuji. But there is one thing, she is not satisfied…. It’s her past experience. Just one mistake…. She still keeps it secret…. One day, Yuji invites his friend, Tomoya, to her house. Kyouko feels a presentiment that something bad will happen…. Yes, it actually happens…. Her peaceful life is gradually destroyed….