The plot of the hentai is incredibly difficult to describe. It's practically non-existent in this OVA. Despite the constant mention of the word "sensei," the main character in this story has nothing to do with educational institutions. An old (over 4 decades old), the boss is sexually grooming Hatsune, the new secretary from his office. Out of gratitude for the fact that she was hired, the girl is ready to satisfy any desire of her boss. Even though Hatsune acts like a person in love with her "sensei", romance and love have never been observed in such life situations...