Cinderella no Kake

Cinderella no Kake summary:

"You're not the type of girl who can attract a man. If you get proposed to within the next month, I'll give you a thousand dollars!" Charlotte is a talented graphic designer, who spends her days in baggy jeans with ruffled hair. She knew her best friend, Gabe, doesn't see her as a lady, but if he's going to make such a bet, she can't just take it lying down! Charlotte decides to get back at Gabe by dramatically transforming herself...