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…