How many movies have Katsushi Oota and Kenichi Suzumura collaborated on?

They have worked on 7 movies together! Their first movie together was The Garden of Sinners: Overlooking View (2007) while their highest rated movie together was The Garden of Sinners: A Study in Murder (Part 2) (2009). They have not worked together since The Garden of Sinners: Future Gospel (2013). They are most known for their animation films together.