How many movies have Kentaro Otani and Yui Ichikawa collaborated on?

They have worked on 2 movies together! Their first movie together was Rough (2006) while their highest rated movie together was Nana 2 (2006). They have not worked together since Nana 2 (2006).

Crew
Director
Role
Nana Komatsu (Hachi)
Crew
Writer