Nightmare Detective / Akumu tantei (2006)

We first meet Kagenuma, the Nightmare Detective (Ryuhei Matsuda), with an in joke about J-Horror itself. He has entered the nightmares of Oishi, an old man who keeps a long black wig on the wall and seems to be haunted by it. Kagenuma explains the nightmares, but Oishi prefers to stay in the dream world …