Her son Seigo remembers the excitement of his first love when his mother's friend Ayumi returns to his hometown for the first time in 10 years. That night, by chance, he receives a kiss from Ayumi, who is drunk and in a good mood, but... Seigo, who was reluctant, couldn't contain his excitement at her bold action, and when he decided to sneak a peek into the bathroom, he witnessed Ayumi masturbating. he ran away from the scene in a panic