Her father-in-law Kojiro came to Tokyo to get his chef's license, and his wife Iroha decided to teach him how to cook... As he continues to teach her, Kojiro's touches on her body increase, and Iroha feels her body heat up. Since she has no sexual relations with her husband, she can't help but masturbate in the bathroom, but Kojiro sees her. Iroha can't contain the throbbing in Iroha crotch from the intense and obscene sex that her husband doesn't have, and her body becomes more and more sensitive as her father-in-law humiliates her without restraint...