Natsuki Takeuchi, a young employee working for a small and medium-sized company, secretly has feelings for the older and married Director Sato. Seeing how he always seems to be dominated by his wife, Natsuki approaches the director, saying "I don't want to lose to his wife." Then, in order to have a relationship that is superior to his wife, she allows the director to have "anal sex," which was his sexual fetish, and gradually awakens to the pleasures of anal sex and cums! She deep-throats herself, has a sweet anal sex session in a hotel, etc. ... The anal affair can't be stopped now.