How many movies have Erina Kojima and Hideki Ito collaborated on?

They have worked on 2 movies together! Their first movie together was The Piano Forest (2007) and was their highest rated movie together. They have not worked together since Miyori's Forest (2009).

Miyori's Forest (2009)

Crew
Key Animation
Crew
Storyboard Artist
Crew
Animation Director

The Piano Forest (2007)

Crew
Key Animation
Crew
Key Animation