Help finding Manga

The manga I'm trying to find included a boy from a wealthy household holding some sort of competition or elimination to find his missing sister that disappeared some years ago...In the competition all kinds of girls show up pretending to be his sister and the protagonist is his sister but doesn't know it (pretty sure that's how it went)..and in the end she picks up a doll or something and the boy realizes that she's his sister..appreciate any attempts at finding this manga.