Sumiko Kawai

The manager of Kawai Dormitory and the sister of Ritsu's grandfather. She interviews potential boarders first to determine background and compatibility with the current residents. Wanting to be a perfect side character in a romantic drama, she sometimes practices on Usa by giving observations and comments that are meant to be of no value. Rather insightful, she knows just when to serve a resident's favorite dish for dinner.

She keeps a doll collection in her room.