How many movies have Akihiko Oka and Tomokazu Seki collaborated on?

They have worked on 4 movies together! Their first movie together was Doraemon: Nobita and the Space Heroes (2015) while their highest rated movie together was Doraemon: Nobita's Chronicle of the Moon Exploration (2019). They have not worked together since Doraemon the Movie: Nobita's Sky Utopia (2023). They are most known for their family films together.