How many movies have Koichi Hashimoto and Seiji Yokoyama collaborated on?

They have worked on 4 movies together! Their first movie together was Saint Seiya: Evil Goddess Eris (1987) while their highest rated movie together was Saint Seiya Heaven Chapter: Overture (2004). They have not worked together since Saint Seiya Heaven Chapter: Overture (2004). They are most known for their fantasy films together.