How many movies have Ichiro Nagai and Yugo Serikawa collaborated on?

They have worked on 4 movies together! Their first movie together was The Panda's Great Adventure (1973) while their highest rated movie together was Twelve Months (1980). They have not worked together since Spooky Kitaro: The Strongest Ghost Army! Landing in Japan!! (1986). They are most known for their animation films together.