How many movies have Hitoshi Iwamoto and Ryoko Yuui collaborated on?

They have worked on 5 movies together! Their first movie together was Hakusen Nagashi 19 no Haru (1997) and was their highest rated movie together. They have not worked together since Hakusen Nagashi - Yume Miru Goro wo Sugitemo (2005). They are most known for their drama films together.