Married for 20 years. Momoko, who is sexless with her husband, one day encounters the scene of her daughter's attempted sexual act... Confused, Momoko secretly feels envious. When her daughter's boyfriend, Yuta, consults her... Apparently, his penis is too big to fit, and Momoko, surprised, can't resist trying to accept just the tip of his penis. Reminiscing about the pleasure of her vagina after a long time, Momoko recalls the joy of being a woman. When Yuta pressures her again, her reason flies away, seeking only the pleasure of the penis...