Akihiro, unable to hide his nervousness upon learning that his first love and his mother's junior, Sayami, is coming. However, during their reunion after 10 years, he intentionally acts cold due to embarrassment... That night, slightly drunk and in high spirits, Sayami tries to get Akihiro to turn around by kissing him. Unable to sleep from the excitement of the sensation of his lips touching his first love, Akihiro can't help but embrace Sayami after she gets out of the bath. With her unfulfilled desires due to her strained life with her husband, her body responds sensitively...
