How many movies have Mitsunori Hattori and Yûki Okano collaborated on?

They have worked on 5 movies together! Their first movie together was Siren the Ghost Story Again (1994) while their highest rated movie together was Angel of Darkness 4 (1996). They have not worked together since Wild Touch: Pachisuro Daikōryaku (1999). They are most known for their horror films together.