18+ Kono Otoko, Moujuu ni Tsuki Youchuu. Kiken na Kouhai no Gokujou Sex

Rio Iwai works at the planning department of a big sports goods maker. She is known for her beauty and efficient work, but she stands out in the company to the point of having been given the nickname of "Miss Malediction." The reason for the distance she keeps with her colleagues lies in her past... She's particularly bad at dealing with Motoki Noguchi, a colleague a year younger than her. However, he suddenly confesses his feelings at company drinks after she's had one too many! She turns him down right away, but he won't give up! And on top of that, his skilled caresses make her lose her mind...

A heated story of a love affair in the office!

(Source: Kasakura Shuppansha)