Reiko Mukogawa

Reiko Mukogawa (武庫川 玲子 Mukogawa Reiko) is the vice-principal of the Seito Sannomiya Private School who works closely with Chieko Sannomiya. Like Chieko, Reiko is a stern man-hater as she was resulted from a failed marriage and she grows suspicious of Hibiki Amawa early into his career where she tries debunking his identity several times. In Episode 13, Reiko was successful in exposing Hibiki's true gender, but her plan in turning Seito into an all-girls school was tarnished by Fuko Kuzuha's defensive speech for Hibiki.

Personality
Reiko strongly dislikes and distrusts men who aids Chieko Sannomiya's pursuit in converting Seito Sannomiya Private School into an all-girls' school and she doesn't trust Hibiki Amawa from the start and sets out to ruin the new teacher's credibility.

Trivia

 * The kanji for her name Reiko means "the tinkling of jade" (玲) (rei) and "child" (子) (ko).
 * Reiko's surname Mukogawa means "military" (武) (mu), "warehouse" (庫) (ko) and "river, stream" (川) (gawa).