Aoki-kun to wa Osake ga Nomenai

It's Sui's 20th Birthday! And her boyfriend takes her out to dinner to break up with her. Seeing that she's already out, she'd rather not end her birthday on a sour note and decides to enjoy her first legal drink! ...But it only brings her back to thinking about love and romance. "I want to be loved... desired..." The next day: Sui wakes up at home, but next to her... some gorgeous young man?! A fun romance of dumping, bouncing back, and getting busy!

(Source: MangaPlaza)