Rica and Kengo have been living together for the past four years. It's been a very happy time for Rica; the only dark spot being an accident she caused during a shoot for a commercial in which Kengo's good friend, Shibata, nearly lost his life. The memory of this event weighs heavily on Rica's conscience. One night Kengo tells Rica that he has fallen in love with a charming but "inscrutable" woman named Hanako. Kengo moves out of their apartment and, although Rica is terribly hurt and confused, she cannot bring herself to hate Kengo. Nevertheless, she suffers a great deal as a result of their separation. She cannot believe her eyes when Hanako suddenly appears at her door, but this is not nearly as baffling as when Kengo also turns up at Rica's apartment looking for his new lover. For a while this threesome co-habit in a kind of Ménage à Trois, but then Hanako starts staying away for nights on end - without telling either of them where she goes. Kengo soon tires of the situation; Rica... 轉載一些日本網友的評論。 理加（原田知世饰）与健吾（渡部笃郎饰）是一对同居四年的情侣，在理加完全无预警的情况下，健吾却深深爱上另一个女孩华子（菅野美穗饰）疑情的理加原本只想守著两人同居的房子等待健吾回头，怎奈热情奔放的华子却硬是闯入理加的生活圈，刚开始理加对这个与自己截然不同的情敌完全没有好感，可是不知不觉中却渐渐对她产生关心，难解的三角关系会如何找到出口？
