Duetto (2004)

Blurb:
College mates Shinobu Miura and Eiichi Tashiro have more going on between them than classes and studies—close proximity and animal attraction can create strange bedfellows—but they also have little-to-nothing in common. Shinobu wallows in denial of any feelings he may have, while Eiichi is eager for a commitment. When Eiichi accepts an offer to work overseas for an American photographer, will Shinobu realize too late how much two opposites can make a perfect duo?

Source: www.anisearch.com/manga/2317