Full House Kiss

Suzuhara Mugi is fifteen and looking for her missing older sister, her only family. The trail leads to Shoukei Academy, an enormous, heavily secured private school that does not accommodate uninvited visitors. Every legitimate route onto campus is blocked. The break she needs comes when she literally runs into Midou Kazuya, the son of a corporate president and one of the school's most prominent students. He is not moved by her situation, but he is pragmatic: he will get her onto campus in exchange for service as a maid at the house he shares with three other elite students known at the school as the La Princes.