How many movies have Katsuhiko Watabiki and Shōtarō Ikenami collaborated on?

They have worked on 9 movies together! Their first movie together was Onihei's Detective Records (1995) and was their highest rated movie together. They have not worked together since Onihei Crime Files: The Final Kohen - Unryu Ken (2016). They are most known for their drama films together.