Reiko Mukogawa

Vice-principal of the Seito Sannomiya Private School. She works closely with Chieko Sannomiya, and like her, is a stern man-hater, resulting from a failed marriage. Mukogawa grows suspicious of Hibiki early into his career and tries debunking his identity several times. She has one child who is never mentioned to both the staff or students of the institution.

(Source: Wikipedia)