Yuno Kawakami

Yuno is a second-year girl who will follow Wakana around school, protecting her with a wooden sword from pushy guys or just helping her with simple things like purchasing meal tickets at the cafeteria. She has a forceful personality which helps whenever she is protecting Wakana, whom she addresses while adding the Japanese honorific sama (さま?) to the end of her name as a sign of intense respect.

(Source: Wikipedia)