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)

Amawa Hibiki is a young man just out of college, with an education to be an athletics teacher. He's been having a hard time finding a job since he graduated, so all his money has gone towards living expenses. When his landlady demands his first payment to live in her living establishment upfront, he heads to the local middle school to get hired as a teacher. However, the principal refuses to hire him without hesitation. She will not hire men as teachers and makes it clear that she hates all men, saying they put no love into their passions and work. Amawa does not give up and with the help of his landlady, he crossdresses as a woman without a second thought, and gets hired, so he can earn money and also prove the principal wrong. Now, he has to keep his real gender a secret, and avoid strange situations, including the affections of his students (from both genders).
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(Source: Anime News Network)

Reiko Mukogawa