How many movies have Kyoji Asano and Tetsuya Nishio collaborated on?

They have worked on 4 movies together! Their first movie together was Ghost in the Shell 2: Innocence (2004) while their highest rated movie together was Ghost in the Shell: S.A.C. 2nd GIG - Individual Eleven (2006). They have not worked together since Blood-C: The Last Dark (2012). They are most known for their animation films together.

Blood-C: The Last Dark (2012)

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Key Animation
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Key Animation

Ghost in the Shell: Stand Alone Complex - Solid State Society (2006)

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Key Animation
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Character Designer
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Storyboard Artist

Ghost in the Shell: S.A.C. 2nd GIG - Individual Eleven (2006)

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Animation Director
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Character Designer
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Animation Director

Ghost in the Shell 2: Innocence (2004)

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Key Animation
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Character Designer
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Supervising Animator
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Key Animation