The 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.
After giving Julia the first Secret Note, you can get intel. A second one allows you to see your slaves topless in the library. Giving her a third one allows you to see her topless. She needs four notes to save the Protagonist from Drape's trapdoor, while obtaining her a total of five notes makes it possible to start dating her. The earliest possible you can start dating her is by giving her the notes from the third (she shows up), fifth (see slaves topless), seventh (see her topless), eighth (she saves you) and tenth floors (date her).
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.
Trivia
- The library was the last location in the school to get an updated background - it didn't happen until version 0.38.