How many movies have Kenji Nagai and Mitsunori Hattori collaborated on?

They have worked on 5 movies together! Their first movie together was Kaiki Senyaichiya Monogatari: Sen no Maki (1991) while their highest rated movie together was Skyscraper Hunting (1991). They have not worked together since Bloody! Scary Horror! (1992). They are most known for their horror films together.