Такахаші Нанамі

Also known as Nana-chan is a girl who confesses her love too easily, pretty clumsy, and looks very cute. She takes a while to sort out her feelings, and is confused by what her heart tells her and what she knows to do. At the beginning of the anime, she decides that she will not become a lovestruck idiot over Yano like two thirds of the school, and fails as she becomes more and more curious of him.

(Source: Wikipedia)