The Chiesters are bunny-girl servants summoned by Beatrice. It is said that there is no escape from the Chiesters attacks, and they can even locate and bring back a corpse. They have red eyes, bunny ears, and elaborate military-styled outfits. It is hinted that they are connected to Maria's three (originally four) rabbit toys.

She is named after the .45 Winchester shotgun. Chiester 45 wears a red uniform and has long pink hair tied in two ponytails. She has a serious look most of the time. Her duty is battle control, information gathering and data mining, trajectory calculating and sending it to Chiester 410.

(Source: Wikipedia)