How many movies have Hitoshi One and Taisei Iwasaki collaborated on?

They have worked on 2 movies together! Their first movie together was Vortex of Love (2013) while their highest rated movie together was New Dimension! Crayon Shinchan the Movie: Battle of Supernatural Powers ~Flying Sushi~ (2023). They have not worked together since New Dimension! Crayon Shinchan the Movie: Battle of Supernatural Powers ~Flying Sushi~ (2023).