大谷 桃子

She is a student teacher who came to Kouga Academy in the new term as a math teacher. With the exception of university, she has never been to a school with boys (having always attended all-girls' schools). Since she has a rather upbeat personality, her students often call her informally, which she does not object to and therefore naturally results in her high popularity among the student body. Like Yuko and Ruu, Momoko is an unlockable character.