Oujisama to Haiiro no Hibi

Atsuko is a high school student who leads a harsh life because of her alcoholic father, working dubious part-time jobs just to get by. She figures misfortune is a given in life and nothing can be done about it. That is, until she meets people at the opposite end of the spectrum: a group of rich high school boys named Ryou, Itaru, and Shuuya. From there, all their fates change drastically… Atsuko becomes a body substitute for the financial group’s heir, Itaru, and is subsequently taken away to a palace and becomes a “prince” in his place. With so much to gain from this deal, what could Atsuko possibly lose?
(Source: the manga habit)