Azuma Otoko Kyou Otoko

Souma was transferred from the Tokyo branch to the Kyoto branch. The day he moved in, the landlord's son Amane returned home, and thus, they ended up being roommates. Souma thought roommates should be friendly, but Amane is pretty aloof. But after accidentally seeing Amane cry, Souma keeps thinking about him...
(Source: Shinshokan, translated)
Note: Includes an extra chapter.