Saya Takagi from High School of the Dead

A woman dressed in a schoolgirl costume, characterized by her long pink hair styled in pigtails with white ribbons and her green skirt. She wears a white blouse with black trim and a large bow at the neck, complemented by a green scarf tied around her neck. The overall impression is that of a cosplay or costumed character from an anime or manga series, likely designed to evoke a sense of nostalgia or familiarity for fans of Japanese pop culture.