When Ami and her step-brother, Hiroshi embrace one another in bed, the phone rings; telling them of their parents’ death. A year later, Ami lives with Hiroshi and his wife, Mariko. Seemingly, they look happy but there is undeniable tension between Ami and Mariko. One day, Mariko gets mad at Ami for always coming into their bedroom without permission. Losing her temper, Ami blurts out that she has a relationship with Hiroshi当Ami和她的继兄弟Hiroshi在床上拥抱时，电话响了;告诉他们父母的死讯。一年后，Ami和Hiroshi以及他的妻子Mariko住在一起。表面上看，他们看起来很开心，但不可否认的是，Ami和Mariko之间关系紧张。有一天，Mariko对Ami很生气，因为他总是未经允许就进入他们的卧室。大发雷霆的Ami脱口而出，说她和Hiroshi有关系。