No matter how attractive, family is family. You shouldn't think of them as the opposite sex. That's what I decided, but... Yumi, who remarried a much older husband, quickly became close with her step son, Tatsuya, who was around the same age. Just as I thought we could live a happy married life without any problems, Tatsuya confessed that he loved me not as a mother, but as a woman. Confused by the sudden turn of events, Yumi found herself increasingly aware of Tatsuya...