How many movies have Shōji Sakai and Toshimasa Niiro collaborated on?

They have worked on 3 movies together! Their first movie together was Mourning Wife (2001) while their highest rated movie together was A Lonely Cow Weeps at Dawn (2003). They have not worked together since Mahiru no furinzuma: Mio no kairaku (2003). They are most known for their romance films together.