How many movies have Hotaru Umino and Mametarou Mamezawa collaborated on?

They have worked on 1 movie together! Their first movie together was HBAD-453 Widow Forest Hotaru Kept Being Caught By Her Husband's Relatives (2018) and was their highest rated movie together. They have not worked together since HBAD-453 Widow Forest Hotaru Kept Being Caught By Her Husband's Relatives (2018).