Minohodoshirazu No Cinderella

Everyone has a past they want to erase. Kaname Murai, who harbors intense complexes about her past, studies like crazy to leave her old self behind, and successfully enters a prestigious university. However, there she meets a man named Yuuma Yamashiro, who knows about her ugly and sordid past... This is an anti-Cinderella story about a girl who keeps moving forward despite being covered in mud!

(Source: Comic Walker, translated)