Kawamote Joushi Ga, Kawai Sugiru Ken summary:

Everyone at the office is a little afraid of the boss, Mr. Mano, probably because he's always scowling and rarely talks. When Akane hits a rough patch and has little choice but to crash at Mr. Mano's place for a while, he spends his days on edge, painfully aware that he's an unwelcome guest... Until one day, in a strange turn of events, Akane finds out Mr. Mano's "dark secret" and can't help but feel a sharp twinge of affection. The guy's got a scary face, but then he'll get all bashful and turn pink, or let out a shy little laugh, or... Hang on, this is just way too cute!!A super lovey-dovey romcom chock full of books that don't match their covers, starring a do-gooder businessman and his grumpy-faced boss.