門倉 葉子

Youko is in the same grade as Kimie, she the student council's vice-president at the school and has a cool personality. 
She becomes the student council vice-president, or the president, depends on the route. She is called "Mikado no Kimi" in the third grade.

Taken from url=http://en.wikipedia.org/wiki/List_of_Otome_wa_Boku_ni_Koishiteru_characters.