How many movies have Eiji Yamamori and Kazuyoshi Onoda collaborated on?

They have worked on 9 movies together! Their first movie together was Princess Mononoke (1997) while their highest rated movie together was Spirited Away (2001). They have not worked together since Mary and The Witch's Flower (2017). They are most known for their animation films together.

Mary and The Witch's Flower (2017)

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Key Animation
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Key Animation

When Marnie Was There (2014)

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Key Animation
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Key Animation

The Wind Rises (2013)

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Key Animation
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Key Animation

From Up on Poppy Hill (2011)

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Key Animation
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Key Animation

Ponyo (2008)

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Key Animation
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Key Animation

Tales from Earthsea (2006)

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Key Animation
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Key Animation

Howl's Moving Castle (2004)

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Key Animation
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Key Animation

Spirited Away (2001)

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Key Animation
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Key Animation

Princess Mononoke (1997)

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Animation
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Animation Manager