The affair that Mahiro has been having with the married Yutaka has been the only escape from her troubled family life caused by her father's own extra-marital affair. Mahiro despises her father for his past infidelity but cannot bring herself to stop Yutaka from being unfaithful to his wife. However, an unplanned pregnancy triggers a series of events that promises to shatter the small bubble of happiness Mahiro has made for herself and bring the brewing dissonance in her family to a head.
一段徘徊在不倫之間的甜蜜愛情。 松島菜菜子一位在廣告代理店工作的上班族—藤谷真尋,她和男友分手後,卻喜歡上椎名桔平所飾演的上司—五島明良。不久後兩人開始交往,對真尋來說,她一方面無法克制自己對明良的感情,但另一方面卻又內心充滿矛盾與罪惡感。原來她父親年輕時也曾發生不倫,並因此而造成哥哥去世,這件事後,她對父親的行為就一直非常反感。沒想到她也陷入不倫的感情中。