How many movies have Hochu Otsuka and Issei Arakaki collaborated on?

They have worked on 3 movies together! Their first movie together was Kizumonogatari Part 1: Tekketsu (2016) while their highest rated movie together was Kizumonogatari Part 2: Nekketsu (2016). They have not worked together since Crayon Shin-chan: Honeymoon Hurricane ~The Lost Hiroshi~ (2019). They are most known for their animation films together.