Jimihen!! Jimiko wo Kaechau Jun Isei Kouyuu!!

Actually, Ryouhei Hachiya gets along well with his superior Buchou, but now he is given a difficult assignment by the other man: in order to cover up an unexcused day of absence, he is supposed to meet Rena Yukuhashi, of all people, an unattractive colleague, after work to find out if she is still a virgin.
At first, Ryouhei is not very enthusiastic about this assignment, but when he actually goes on a date with her, he quickly finds out that there is more behind the reserved façade than expected. They start an affair with each other and soon he begins to feel more for his partner. However, this causes problems with his superior, to whom he doesn’t want to reveal any of this …

じみへんっ!!~地味子を変えちゃう純異性交遊~, Jimihen!! Jimiko o Kae Chau Jun Isei Kouyuu, Simple yet Sexy, 地味变!!～改变土妹子的纯洁异性交往～, Pure Heterosexual Intercourse That Transforms a Plain Girl, 지미헨!! ~수수한 자를 바꾸어 버리는 순수 이성 교제~, Pure Heterosexual Intercourse That Transforms a Plain Girl