Chiaki was delighted to hear that her daughter Eri had found a boyfriend. His name was Hayato, a polite, kind, and warm-hearted young man. Gradually, Chiaki herself began to feel drawn to his gentle nature. One day, she accidentally witnessed Eri and Hayato meeting secretly. The sight made her heart race, and she returned to her room, giving in to masturbation. Every time she thought of Hayato, her pulse quickened, and eventually, taking advantage of Eri's absence, she made a move on him.