Watashi ni dake Temparu Joushi no Hanashi

My boss, Reikawa-san, always has a frown on his handsome face that makes people at the company feel uncomfortable. But for some reason, in front of me, he seems to show his more personable side side… blushing, acting self-consciously, and stuttering! A romantic comedy about a nervous boss who is a serious working man who becomes a cute and sweet guy when he's in love!

(Source: Gangan Online, translated