Yuri remarried to her husband who had lost his wife and lived with his son. One day, five years after I got married, I saw something when I went to the shower after having sex with my husband. It's a big ichimotsu that you can't miss. From that day on, the distorted affectionate relationship between Yuri and Yoshinori, who began to see her husband's stepchild as "the opposite sex," began.