Kosupure no hito (2006)

Whenever Ami and her step-brother, Hiroshi accept one another in bed, the telephone rings; advising them of their parents' death. 12 months later, Ami resides with Hiroshi and his spouse, Mariko. Apparently, they are delighted but there is indisputable pressure among Ami and Mariko. One day, Mariko gets angry at Ami for always following into their bedroom without permit. Giving up her calm, Ami blurts out that she has a connection with Hiroshi.