How many movies have Keiju Kobayashi and Takeshi Matsumoto collaborated on?

They have worked on 1 movie together! Their first movie together was Inspector Muta's Incident Files: Yokohama to Kushiro Field. The Mystery of the Triple Murder That Only Marimo Knows. (2001) and was their highest rated movie together. They have not worked together since Inspector Muta's Incident Files: Yokohama to Kushiro Field. The Mystery of the Triple Murder That Only Marimo Knows. (2001).