How many movies have Futoshi Nishiya and Koji Oji collaborated on?

They have worked on 4 movies together! Their first movie together was High☆Speed!: Free! Starting Days (2015) while their highest rated movie together was Free! the Final Stroke The First Volume (2021). They have not worked together since Free! the Final Stroke The Second Volume (2022). They are most known for their comedy films together.