How many movies have Kenichi Ohki and Takenori Tsukuma collaborated on?

They have worked on 4 movies together! Their first movie together was Case Closed: The Fourteenth Target (1998) while their highest rated movie together was Rurouni Kenshin: New Kyoto Arc: The Chirps of Light (2012). They have not worked together since Rurouni Kenshin: New Kyoto Arc: The Chirps of Light (2012). They are most known for their animation films together.