Ten years after returning to his hometown, Seigo, the son, recalls the excitement of his first love when he meets his mother's friend, Ayumi. That night, Ayumi, who was drunk and in a good mood, invites him for a kiss, but hesitant Seigo is unable to calm his excitement in the face of her bold actions. Determined, he secretly peeks into the bathroom and witnesses Ayumi indulging in self-pleasure. Flustered, Seigo flees the scene, but Ayumi, noticing it, visits Seigo's room late at night...
