After his fifth heartbreak, Atsushi, the stepson, is completely disheartened. Concerned for him, his stepmother Rika tries to help him regain his confidence by teaching him about a woman's body through sex. She casually invites Atsushi to have sex, thinking that using a condom will eliminate any risk of pregnancy... But when Rika doesn't seem to be enjoying it at all after insertion, Atsushi loses patience and secretly removes the condom...
