4x1 - Natsume Yujin-cho

Natsume encounters some strange, monkey-mask wearing demons while out in a forest. They want the book of friends, and start physically threatening him until Natsume is saved by Nyanko-Sensei. Later on, Natsume encounters the demons again and is captured by them, and brought to their forest. Meanwhile, Nyanko-sensei learns some interesting things about the forest the monkey mask demons live in. Running away from the demons, Natsume and Nyanko-sensei are unintentionally saved by an exorcist - Matoba! Not wanting to confront him, Natsume runs again but gets lost in the woods, and stumbles upon a house... belonging to the Matoba. Both he and Nyanko-sensei are captured, but manages to escape and find each other, though being lost in the house. The episode ends with Matoba finding Natsume saying, "It's been a long time, Natsume Takashi-kun.