Saya, who married an older husband. Her husband was remarried and lived with his son Tatsuya, forming a new family of three. Saya thought she could have a comfortable parent-child relationship with Tatsuya, who was close to her husband's age and felt like a friend. However, Tatsuya fell in love with Saya not as a stepmother but as a woman. Without noticing the conflicting emotions, Saya ended up spending a week alone with Tatsuya...
