Kouhai-kun dake ga Shitte Iru

Mizuhara Aoi, 29, has lived her life doing what's expected of her and causing as little trouble as possible for those around her. Before she knew it, people were calling her a career woman. With her slanted eyes and stern appearance, she thought it was impossible for a man to love her, but she had a boyfriend who was okay with that.

Yes, she "had" a boyfriend, too. "I've found someone I want to protect," he said, dumping me in the company's conference room. That night, not wanting to go home, I stopped off at a bar and was drinking when a handsome, playboy-ish man started clinging to me. As I was talking to him, I started thinking about my ex-boyfriend, so I opened a drink to escape, and the next thing I knew... I was in bed with this playboy, naked. What on earth was going on?! A secret, doting love story with a junior colleague!

(Source: Square Enix, translated)