A sex movie of Reiko Kobayakawa, Hajime is a third-year college student. His mother is about to remarry, so he returns home for a day. While walking through the park, he suddenly meets Reiko, his mother’s close friend. The two were very close before, so Reiko decides to go with Hajime to his mother’s place. When he returns to his previous room, the room has now become a storage room. Worried about not having a place to sleep, Hajime is invited by Reiko to her house to spend the night. It is also here that he learns that Reiko is not really happy. Her husband is always on business trips, and even has a mistress outside. Being close to an extremely beautiful and seductive woman like Reiko makes the college student unable to control his lower body. Reiko finds out but does not blame him, but gently soothes it for him, satisfying Hajime’s desire while also wanting to ease his own loneliness…