Mukai no Heya no Neko

Yuki Mitsuhara's a dork with glasses who's cold, hides his true feelings, has few friends, and always acts like a square. The person he has a crush on is the playboy who lives across the hall from him in their college dorm, Kouki Shima. Kouki's a heavy smoker who has a new girlfriend every few months and is always being scolded by Yuki. But, the truth is, Yuki's crazy about Kouki. Then, one day, Kouki finds out that Yuki's gay, but not in the way that Yuki wants him to...! This is a pure love story between an aggressive playboy and a masochist dork with glasses.

(Source: Renta!)