|Hair||, Pink, Spiky Bangs, Twin Tails|
|Eyes||, Red, Tareme|
|Body||, Kemonomimi, Pale, Slim, Teen|
|Clothes||, Bunny Dress, Cuffs, Gloves, Knee-high Boots, Military Uniform, Miniskirt|
|Personality||, Coward, Sensitive, Timid|
Side character - Umineko no Naku Koro ni Chiru
|Voiced by||Mizuno Mariko|
Chiester 45 is a weapon in contract with Beatrice, 45 has a very methodical and timid personality, and her persecution complex is somewhat strong. This makes her compensate well for the weakness of 410's rough personality when they work as a pair. Since she cannot stand silence, she sometimes becomes emotionally insecure if she isn't always being ordered by someone. 45 has excellent capabilities in searching for the enemy and deciding orders. The sisters' battle power is multiplied by her support.