Married for 20 years, Momoko, who has not had sex with her husband, one day encounters her daughter attempting to have sex... Momoko is confused, but secretly feels envious. At that time, her daughter's boyfriend, Yuta, comes to her for advice... Apparently, his penis is too big to fit in, and Momoko is surprised. She can't help but try to accept his penis, saying "just the tip"... Momoko remembers the joy of being a woman as she feels the stimulation inside her vagina for the first time in a long time. When Yuta comes on to her again, her reason is blown away, and she only wants the pleasure of his penis...