Filled to the brim with knowledge, the Library of Otogakure was once the place where Orichimaru stored his collected data, and kept the rest of the knowledge on jutsu. With the rise of the new Otokage, the entire building that was the storage area was converted into a place of learning, where those eager to learn were welcome.

However, one wing of the building has remained closed off. This area is where all the notes of Orichimaru's experiments are kept. The only way one could gain access to this area is through the Otokage, who for obvious reasons, will not be too keen on the idea.