How many movies have Kazuo Otani and Toshiki Tsuzaki collaborated on?

They have worked on 3 movies together! Their first movie together was 監察医 室生亜季子㉚　震える顔 (2001) and was their highest rated movie together. They have not worked together since Prosecutor Yoko Asahina 18 (2016). They are most known for their mystery films together.