Yukari had been married to her former boss for nearly half a year and was getting along well with Akira, her husband's son from a previous relationship. Lately, however, she had begun to feel an unexplainable sense of anxiety growing inside her. One day, a man identifying himself as "Ohsawa" showed up at her doorstep. He handed her an envelope containing photos of her past affair before her marriage, shaking Yukari to the core. A few days later, Ohsawa returned and forced himself on her—only for Akira to witness the entire act. This shocking incident would bring a dramatic change to Yukari's life.