Heart no Kuni de Ochakai (2008)

Alice Minami grew up rich and going to exclusive private schools, till she tires of it and wants to get away from that crowd and goes to a public high school in hopes of making real friends. But when she tries to be friendly her pride takes over preventing her from making any. One day in the library Alice finds herself there with Yuu Tomachi the most popular boy in school. She sees a book Alice in Wonderland and secretly out loud wishes it was real. When suddenly Tomachi tells her they should go and falls out a window in an attempt to save him she reaches out. He grabs her and the next thing she knows they both seem to have found themselves in Wonderland. Even more mysterious is that Tomachi not only seems to know this place and but he also seems to know the locals in the story as well.

Source: www.anisearch.com/manga/1831