How many movies have Kei Sakai and Kenji Hattori collaborated on?

They have worked on 4 movies together! Their first movie together was TWD Express: Rolling Takeoff (1987) while their highest rated movie together was Seito Kaichou Hikaru (2010). They have not worked together since Seito Kaichou Hikaru (2010). They are most known for their animation films together.

Seito Kaichou Hikaru (2010)

Crew
Animation Director
Crew
Animation Director

Initial D: Third Stage (2001)

Crew
Key Animation
Crew
Key Animation

The Three Musketeers: Adventure of Aramis (1989)

Crew
Key Animation
Crew
Key Animation

TWD Express: Rolling Takeoff (1987)

Crew
Key Animation
Crew
Key Animation