Hime x Hime

There is a famous school where rich boys and girls belong to. The school has a traditional custom that a girl called princess governs the school. The main character accidentally enters the school though he is just an average student. But he can't move to a school dormitory because of some troubles, so he starts living at Saki's, the current princess, room. Saki is selfish and he works as her tool. He doesn't like his school life at first, but he gradually gets attracted to Saki...