Satou

Satou is a teenage girl with black hair tied in two pigtails, black eyes and an average height. She is commonly seen wearing the standard school uniform and glasses without a jacket.

Satou is a kind, cheerful and somewhat friendly girl, approaching Joe and giving him a cupcake from the cooking club. She is also somewhat clumsy, though that clumsiness makes her rather charming as noted by Joe and Anzu.

(Source: Prison School Wiki)