How many movies have Sumi Shimamoto and Toshiyuki Watanabe collaborated on?

They have worked on 2 movies together! Their first movie together was Seito Shokun! Kokoro ni Midori no Neckerchief o (1986) while their highest rated movie together was Coral Reef Legend: Elfie of the Blue Sea (1986). They have not worked together since Coral Reef Legend: Elfie of the Blue Sea (1986).