Shady

Misa is a lonely, unpopular high school girl who's called "Pooh" for her appearance and the fact that her last name "Kumada" contains the Japanese word for "bear". Misa is puzzled when a popular pretty girl named Izumi, the envy of other female students, suddenly shows interest in becoming her friend. However, Izumi soon begins to reveal a darker side of her personality as the two become closer.
(Source: Eigapedia)