From Renta!:

A secret relationship between two people that began with a crazy request from a hidden handsome junior colleague.

"Ms. Yokoi, please have sex with me." This is how my relationship with him had its crazy beginning... Natsuki Yokoi is 28 years old. As a career woman in her late twenties, she is immersed in work every day and has no time to or interest in finding a boyfriend. Her superiors are unreasonable and she is overwhelmed with work, but fortunately, she is helped a lot by the work of her excellent junior colleague, Minato Sakuragi. Sakuragi has a bad reputation among the women in the company due to his dull appearance and cold attitude, but it seems that his true face is quite handsome...

Official English Translation: Renta!