Wife "Kokone" begins working part-time as a rental girlfriend to help support the household, with her husband's permission. When her husband goes away on a long business trip, she seizes the opportunity to invite a virgin college student to her home for an intense deflowering experience. Claiming it's "just once," she indulges in passionate, creampie-filled sex with him late into the night. A taboo, temporary affair unfolds between them.