Stepmother Yuu had been emotionally drawn to Shinya, her husband's stepson, since the beginning of her marriage. One day, when Shinya confessed his feelings to her, the two realized their mutual attraction and began a secret relationship. Behind the father's back, they repeatedly shared kisses and intimate touches, deepening their bond each day. In the quiet of the night, they exchanged tender kisses, savoring their own special moments together. Hidden emotions began to bloom, unfolding a new romantic affair between them.