Thought So
The Kawai Complex residents (really just Mayumi, Sayaka, and Shiro) are fooling around in the living room as usual. Amidst the chaos, Ritsu's lips and Usa's arm connect. Ritsu's face is bright red as she storms out of the room. The next morning, she is still noticeably unsettled, which Usa finds very endearing.
Aired 02/05/2014EP 5 - Thought So

2014
The Kawai Complex Guide to Manors and Hostel Behavior
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!