I'm Afraid of My Co-Worker With Big Boobs

Miki, an ordinary office worker, finds himself seated next to his bitter classmate at a drinking party. He keeps drinking to avoid conversation, but he gets drunk, the next thing he knows, his girlfriend is taking him home...! This is a love-comedy manga about a loser virgin with a phobia of big tits and his bombshell-tittied roommate who has a crush on him.