Otoha is Yūma and Sumomo's mother. She also runs the Oasis cafeteria, which is often used by the students.

Kamizaka Haruhi having been rescued when she was young by a mage, longed to be a mage herself, so she enrolled into a special school that allows regular and magic classes into two different sections. Together with her rival/best friend, Hiiragi Anri, they study magic together while she is searching for the boy that saved her years ago, to give him a Valentines' chocolate.
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(Source: Anime News Network)

With the help of the combination of many different magic, Jun gets turned into an actual girl.

Otoha Kohinata