How many movies have Kenji Yamauchi and Kouki Ono collaborated on?

They have worked on 1 movie together! Their first movie together was Honto ni Atta Kowai Hanashi: 25 Shuunen Tokubetsu-hen (2024) and was their highest rated movie together. They have not worked together since Honto ni Atta Kowai Hanashi: 25 Shuunen Tokubetsu-hen (2024).