How many movies have Kenichi Mori and Sen Arima collaborated on?

They have worked on 16 movies together! Their first movie together was Harenchi mesu: Hiwai hentai nozoki (2009) while their highest rated movie together was Pervert Observation Shame Hole Bare (2015). They have not worked together since Molester Train: Pervert's dreams and reality (2017).