By chance, he and his aunt Shiori come to a hot spring trip together. Kenji, who has forbidden feelings towards Shiori, pretended to be calm so that he would not be able to realize that he was excited. However, he is unable to contain his desires and peers at Shiori's bath... What he saw there was Shiori indulging in a lonely masturbation in the bathtub. Kenji's rationality is greatly shaken by his seductive appearance.
