尾美 小夜子

A bespectacled girl who is a class president and the top student in her grade, both in academics and bust size. She's a level headed honor student, but her expression doesn't change much, which makes it hard to understand her thoughts. She isn't used to expressing her feelings, but in reality, she has a cheerful and kind personality. 

Has a thing for middle aged men, and after knowing that the protagonist just divorced, she went and asked him to have sex with her. 

Official Site