How many movies have Rima Nishinaka and Seiji Matsuda collaborated on?

They have worked on 7 movies together! Their first movie together was The Garden of Sinners: Future Gospel (2013) while their highest rated movie together was Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020). They have not worked together since Demon Slayer -Kimetsu no Yaiba- The Movie: Mugen Train (2020). They are most known for their animation films together.