How many movies have Junji Inagawa and Shimako Iwai collaborated on?

They have worked on 3 movies together! Their first movie together was Junji Inagawa: Sleepless Ghost Stories: Tales 1 (2009) and was their highest rated movie together. They have not worked together since Kaidan Saikyou Sen 2018 The Decisive Battle (2019). They are most known for their horror films together.