Suki, Kamo

The story is about Ooshima, a non-social university student, and Murai, his overly friendly neighbor who is from the same university. Ooshima has a physical relationship with Shousuke who is in his class, however, Shousuke treats their relationship as a joke. Ooshima gets lonely and, after spending some time with Murai, his feelings waver. (Source: AniList)