How many movies have Akio Otsuka and Noboru Wada collaborated on?

They have worked on 1 movie together! Their first movie together was Eikou e no Spur: Igaya Chiharu Monogatari (1997) and was their highest rated movie together. They have not worked together since Eikou e no Spur: Igaya Chiharu Monogatari (1997).