How many movies have Director O. and Tetsu Kamiyama collaborated on?

They have worked on 4 movies together! Their first movie together was No Way! My Teacher Found Out About My Livecam!! Ichika Matsumoto (2020) and was their highest rated movie together. They have not worked together since Hot Wife Next Door, She Mistakenly Came to My Place While Tipsy, Rinka Tabara (2022). They are most known for their drama films together.