One day, Saito visited his friend's house, feeling confused about secretly watching Chitose, his friend's mother. He had planned to spend the day at Momoyama's house, but by chance, he caught sight of Chitose masturbating and became completely captivated by her. He never expected such a mature woman to display such an erotic sight. Unaware of his gaze, Chitose continued moaning, completely stealing Saito's heart, leaving him unsure of what to do. His desire to get closer grew stronger, but as a virgin with no experience around women, the actions he came up with were utterly reckless.