How many movies have Yasuhiko Oyama and Yuuji Ikeda collaborated on?

They have worked on 3 movies together! Their first movie together was Hell Teacher Nube: At 0 a.m. Nube is Dead!! (1997) and was their highest rated movie together. They have not worked together since Dr. Slump: Arale's Surprise Bang (1999). They are most known for their animation films together.