How many movies have Shoichiro Okubo and Tsutomu Shibayama collaborated on?

They have worked on 3 movies together! Their first movie together was There Goes Our Hero (1979) while their highest rated movie together was Tsushima Maru: Goodbye, Okinawa (1982). They have not worked together since Tsushima Maru: Goodbye, Okinawa (1982). They are most known for their animation films together.