Mirei visits her daughter's home in Tokyo for a vacation. When she mentions that her daughter's childhood friend has married and is pregnant, her daughter's expression darkens, and she abruptly leaves the room midway through the conversation. Mirei also learns from her son-in-law that although their marriage is otherwise harmonious, they haven't been intimate lately. Though concerned, Mirei decides not to interfere, thinking it's a private matter between the couple. Later, after getting out of the bath, Mirei stops by her daughter's room and catches her son-in-law masturbating with her underwear. Flustered, he tries to hide, but Mirei feels sorry for him, assuming he's simply pent up from lacking intimacy. Overcome with sympathy, she ends up giving him a blowjob and brings him to climax.