How many movies have Jirō Ishikawa and Ken Horiuchi collaborated on?

They have worked on 2 movies together! Their first movie together was 最強OLパチンカーひとみ (2009) while their highest rated movie together was Gintama Yugi Pachinko Queen Nanase Amateur Pachinker Winning Method! (2011). They have not worked together since Gintama Yugi Pachinko Queen Nanase Amateur Pachinker Winning Method! (2011).