How many movies have Ken Ootsuka and Shuko Murase collaborated on?

They have worked on 4 movies together! Their first movie together was Gundam Wing: The Endless Waltz (1998) while their highest rated movie together was Cowboy Bebop: The Movie (2001). They have not worked together since Mobile Suit Zeta Gundam - A New Translation III: Love is the Pulse of the Stars (2006). They are most known for their animation films together.

Mobile Suit Zeta Gundam - A New Translation III: Love is the Pulse of the Stars (2006)

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Mobile Suit Zeta Gundam - A New Translation I: Heir to the Stars (2005)

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Cowboy Bebop: The Movie (2001)

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Gundam Wing: The Endless Waltz (1998)

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