: He meets Dalian , a young girl who is the physical embodiment and guardian of the 900,666 mystical tomes.
: The library is run by the Bat Librarians , creatures who demand absolute silence. [S1E35] Mystic Library
Across different shows and books like The Astral Library , the "Mystic Library" often shares these characteristics: : He meets Dalian , a young girl
: Donatello and Michelangelo head to the Mystic Library to retrieve a specific book for April O’Neil’s school project. : He meets Dalian
While not an "episode 35" (as the anime consists of 12 episodes), this series is the definitive "mystic library" narrative.
In the 35th episode of Season 1, the Turtles venture into a secret, supernatural library located within the Hidden City.