How many movies have Ritsuko Hayasaka and Tomokazu Seki collaborated on?

They have worked on 2 movies together! Their first movie together was Devilman - Volume 3: Devilman Apocalypse (2000) while their highest rated movie together was Haruka - Beyond the Stream of Time 3: Endless Destiny (2010). They have not worked together since Haruka - Beyond the Stream of Time 3: Endless Destiny (2010).