How many movies have Kazuya Nakai and Mika Sawada collaborated on?

They have worked on 2 movies together! Their first movie together was One Piece: Strong World (2009) and was their highest rated movie together. They have not worked together since PERSONA3 THE MOVIE #1 Spring of Birth (2013).

PERSONA3 THE MOVIE #1 Spring of Birth (2013)

Role
Shinjiro Aragaki (voice)
Crew
Key Animation
Crew
Animation Director

One Piece: Strong World (2009)

Role
Roronoa Zoro (voice)
Crew
Key Animation