How many movies have Kenichi Yamada and Shinji Otsuka collaborated on?

They have worked on 10 movies together! Their first movie together was Whisper of the Heart (1995) while their highest rated movie together was Howl's Moving Castle (2004). They have not worked together since When Marnie Was There (2014). They are most known for their animation films together.

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

The Secret World of Arrietty (2010)

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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

My Neighbors the Yamadas (1999)

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Key Animation
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Key Animation

Princess Mononoke (1997)

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Animation
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Key Animation

Whisper of the Heart (1995)

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Key Animation
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Key Animation