My son-in-law, Atsushi, has been completely depressed by his fifth heartbreak.Her mother-in-law, Rika, who was worried about Atsushi, tries to teach her a woman's body through sex in order to regain her confidence.As long as she wears a condom, there's no chance of her getting pregnant, so she casually invites Atushi to have sex with him, but...Atsushi, who has run out of numbness, hides in Rika who seems to be not comfortable at all even if it is inserted and removes the condom.