When I Was Deceived Nyanko-Sensei falls into a well and discovers that there is a strong spiritual barrier inside it, as well as Nanase, Matoba Seiji's assistant. She is looking for a certain jade stone with a strong yokai she had sealed in it, and tells Nyanko-Sensei the story of how she met a humanoid yokai who also happened to be a very powerful exorcist, whom she had initially thought was Natsume Reiko, as a young girl to pass the time. Elsewhere, Natsume is requested to help release that very same yokai from his seal by a friend who had first told young Nanase about Natsume Reiko. Natsume returns his false name, Mikage, from the Book of Friends and meets up with Nyanko-Sensei who decides not to yet tell him about his time with Nanase.