How many movies have Kaito Ishikawa and Yuuichirou Umehara acted in together?

They have worked on 4 movies together! Their first movie together was Kingdom Hearts χ Back Cover (2017) while their highest rated movie together was The Legend of the Galactic Heroes: Die Neue These Collision 1 (2022). They have not worked together since The Legend of the Galactic Heroes: Die Neue These Collision 3 (2022). They are most known for their animation films together.