Hajime is a third-year college student. His mother is about to remarry, so he returns home for a day. While passing through the park, he unexpectedly meets Reiko, his mother's close friend. They used to be very close, so Reiko decides to accompany Hajime to his mother's place. Upon arriving at his old room, which is now a storage room, and worried about not having a place to sleep, Hajime is invited by Reiko to stay overnight at her house. It is here that he discovers that Reiko is not truly happy. Her husband is always away on business trips, and even has a mistress on the side. Being close to a woman as beautiful and alluring as Reiko makes a young man like Hajime unable to control his desires. Reiko notices this but does not blame him, instead gently soothing him and satisfying his desires, while also wanting to alleviate her own loneliness...