How many movies have Kazuya Saito and Nobuhiro Masuda collaborated on?

They have worked on 7 movies together! Their first movie together was Detective Conan: The Last Wizard of the Century (1999) while their highest rated movie together was Detective Conan: The Phantom of Baker Street (2002). They have not worked together since One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom (2008). They are most known for their animation films together.

One Piece: Episode of Chopper Plus: Bloom in the Winter, Miracle Cherry Blossom (2008)

Crew
Key Animation
Crew
Key Animation

One Piece: The Desert Princess and the Pirates: Adventure in Alabasta (2007)

Crew
Key Animation
Crew
Key Animation

One Piece: Giant Mecha Soldier of Karakuri Castle (2006)

Crew
Key Animation
Crew
Key Animation

Detective Conan: Crossroad in the Ancient Capital (2003)

Crew
Key Animation
Crew
Key Animation

Detective Conan: The Phantom of Baker Street (2002)

Crew
Key Animation
Crew
Key Animation

Detective Conan: Captured in Her Eyes (2000)

Crew
Key Animation
Crew
Key Animation

Detective Conan: The Last Wizard of the Century (1999)

Crew
Key Animation
Crew
Key Animation