How many movies have Mitsuko Baba and Terumi Nishii collaborated on?

They have worked on 6 movies together! Their first movie together was One Piece: Baron Omatsuri and the Secret Island (2005) while their highest rated movie together was One Piece Film: Strong World (2009). They have not worked together since One Piece Film: Strong World (2009). They are most known for their animation films together.

One Piece Film: Strong World (2009)

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Key Animation
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Key Animation

Yes! Precure 5 Go Go! Movie: Happy Birthday in the Land of Sweets (2008)

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Key Animation
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Key Animation

Yes! Precure 5: The Great Miracle Adventure in the Country of Mirrors (2007)

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Key Animation
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Key Animation

Futari wa Precure Splash☆Star the Movie: Tic-Tac Crisis Hanging by a Thin Thread! (2006)

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Key Animation
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Key Animation

Futari wa Precure Max Heart Movie 2: Friend of Yukizora (2005)

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Key Animation
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Key Animation

One Piece: Baron Omatsuri and the Secret Island (2005)

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Key Animation
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Key Animation