Sumiko Kawai

As the diligent manager of Kawai Dormitory and Ritsu's grandfather's niece, she carefully vets new residents to ensure they blend seamlessly with the current group. While she jokingly practices her "unimportant side character" persona by offering useless commentary to Usa, her true nature is deeply perceptive. She possesses a keen intuition, often knowing exactly which meal will comfort a student, and finds personal solace in her private collection of dolls.