How many movies have Ryoko Takashimizu and Sai Saiun collaborated on?

They have worked on 4 movies together! Their first movie together was Girls und Panzer das Finale: Part II (2019) while their highest rated movie together was Words Bubble Up Like Soda Pop (2021). They have not worked together since Words Bubble Up Like Soda Pop (2021). They are most known for their animation films together.