Library is one of the locations in Adventure High.
It's located inside the school in the upper right corner.
Julia normally hangs out here as she prefers studying as opposed to venturing into the Dungeon.
Giving Julia two Secret Notes allows you to see your slaves topless in here without Julia caring and after three notes, you can see her topless in here.
Barely anyone ever comes to the library as they prefer venturing into the dungeon in order to become stronger.
According to Julia, there's a ton of books there, including history, fiction and romance - something she seems more interested in than she lets on.