Yutaka visits his relative Saori's house, but her husband has to leave suddenly for work, leaving Yutaka alone with his aunt. Tempted by Saori's mature allure, Yutaka masturbates at night while fantasizing about her. When Saori accidentally discovers him, Yutaka takes advantage of her husband's absence the next day and the two end up having sex. This unexpected encounter with his lewd relative turns Yutaka's stay into an exciting and thrilling holiday.