Natsukanai de Tora-kun

Natsukanai de Tora-kun summary: A girl who falls in love way too easily is working hard to take over her grandparents' café. To stay focused on her dream, she swore off love completely. But one day, a new part-timer shows up at the café—he looks like a total delinquent, and things start to get complicated… (Source: Manga Park, translated)