Upon hearing that her son Yosuke has had his first sexual experience, mother Momoko becomes overly curious about the girl involved and quietly approaches Yosuke's best friend, Yuya, for details. Unbeknownst to her, Yuya has secretly been in love with Momoko for some time. Seizing the moment, he confesses that he's still a virgin and openly expresses his deep feelings for her. Initially brushing it off as "just one time won't hurt," Momoko agrees casually, but soon finds herself overwhelmed by Yuya's sincere emotions and the intense pleasure of their passionate encounter. As her body ignites with the thrill of being with a younger man, Momoko becomes completely consumed by the sensation, creating an unforgettable experience she cannot let go of.