Ep 3. Why?

Usa has gotten used to life at the Kawai Complex, but he hasn't gotten any closer to the resident who's always on his mind, Ritsu. As Usa stresses over his lack of progress, life at the Kawai Complex goes on. One day, Mayumi's ex-boyfriend calls her. Despite the fact that he was three-timing her at one point, Mayumi decides to meet with him.