THE KAWAI COMPLEX GUIDE TO MANORS AND HOSTEL BEHAVIOR
Comedy, Romance, Slice of Life
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!
— Description from AniList community (anilist.co).