How many movies have Daisuke Ono and Kiyoshi Hirose collaborated on?

They have worked on 3 movies together! Their first movie together was Planetarian: Hoshi no Hito (2016) while their highest rated movie together was Cells at Work!: A Gut-wrenching Resurrection of the Formidable Enemy! (2020). They have not worked together since Cells at Work!: A Gut-wrenching Resurrection of the Formidable Enemy! (2020). They are most known for their animation films together.