Ouji-Sama To Haiiro No Hibi

From Wonderland After Hours: Atsuko is a young high-school girl who leads a troublesome life. Working a scandalous job for the sake of survival, her reputation is in tatters and she is scorned by her peers. But one day she is noticed by one of three rich boys, Itaru, which she resembles in an uncanny way. Immediately she finds herself whisked away from her everyday life and into a new world where she is forced to take on the role as Itaru's double and replace him as the "Prince".