Tsubasa has recently been away from her husband, who is much older than her, and her husband's erections have Tsubasa her to miss out on sex. Meanwhile, her brother-in-law is coming to Tokyo and staying with her for a few days. Having not seen Tsubasa since their wedding, his brother-in-law is harboring his ulterior motives and accidentally witnesses her Tsubasa. Unable to resist, he makes advances on her, and her unsatisfied body accepts. From then on, in response to her brother-in-law's prodigious sexual prowess, the two indulge in each other's carnal desires.