Bokura wa Minna Kawaisou

The Kawai Complex Guide to Manors and Hostel Behavior (僕らはみんな河合荘, Bokura wa Minna Kawai-sō, lit. "We Are All From Dormitory Kawai", a play on words that has a double meaning of "We Are All Pitiful") is a manga series by Ruri Miyahara, published in Shōnen Gahōsha's seinen manga magazine Young King OURs since the June 2010 issue. It has been collected in six tankōbon volumes as of November 2014. An anime television series adaptation, produced by Brain's Base aired in Japan between April and June 2014.

Plot
Usa, a high-school student aspiring to begin a bachelor lifestyle, moves into a new apartment only to discover that he not only shares a room with a perverted roommate that has an obsession for underaged girls, but also that another girl, Ritsu, a love-at-first-sight, is living in the same building as well!