When Ami and her step brother, Hiroshi embrace one another in bed, the phone rings, telling them about the death of their parents. One year later, Ami lives with Hiroshi and his wife, Mariko. Apparently, they look happy but there is undeniable tension between Ami and Mariko. One day, Mariko mad at Ami always come into their bedroom without permission. Losing her temper, Ami blurts out that she has a relationship with Hiroshi ..