Kimi wa Koi wo Shiranai

No matter how difficult the matter, Oohashi Kazuya wins out with a composed expression. He’s the absolute ace of the Sales department.
But his true face is that of a wordly-wise man who’s a crybaby.
One day, when a younger accountant who’s made a bad impression, Iwashimizu, discovers his true nature, for some reason he asks him out…?!
For Oohashi, everything is going swimmingly with work and with a perfectly attentive lover, but there’s a dark side to Iwashizumi’s niceness…
I’m happy with only my work, but I won’t run away from this love.

(Source: Japanese publisher, translated)