The Chiester Sister Imperial Guard Corps', also known as the Chiester Sisters, are bunny-girl furniture that can be summoned by ones with a substantial amount of summoning skill. Their main weapon is a bow of light that shoots a beam that can kill a target instantly, the only exceptions being Battler or the Territory Lord. Dlanor says that she has began investigating them and that their vessels are the weapons used in the crime which are the four Winchester guns. One of the four guns is defective, which is Chiester 556's vessel. In Twilight of the Golden Witch, it is confirmed that their original vessels were Maria's ceramic bunnies, one of which Rosa destroyed.
"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."
- Because of a mistranslation by Witch Hunt, the Chiester Sisters became known as the Siesta Sisters to the English speaking audience. This was thought to be the correct translation till Chiester 410 made her appearance in Ougon Musou Kyoku and confirmed it being spelled "Chiester". This translation error has been fixed in the English release of Umineko published by MangaGamer.
- In Dawn of the Golden Witch, it is revealed that the Chiester Sisters is a large force. Chiester 410 names two others, Chiester 127 and Chiester 20. Chiester 127 is said to be able to pulverize a human target at 2 kilometers, while Chiester 20 has a fire rate of 6000 rounds per minute. Since all the other Chiester sisters are named after weapons, Chiester 127 is most likely referring to the 5-inch deck gun which has a 127mm shell and a range well over 2km. Chiester 20 is likely referring to the M61 Vulcan Gatling Gun which fires a 20mm round and has a fire rate of 6,000 rounds per minute.
- The banners they have on their left arms resembles the flag for Iceland, even though their firing codes are written in Greek.
- Their name, Chiester, is a corruption of the word Winchester, a series of guns that Kinzo is shown to own.
- The magical text that appears in the Visual Novel when the Chiesters attack is Japanese transliterated into the Greek alphabet. If you translate it into English, you get:Guidance System Version 07:
- "Firing Guidance System Startup
Welcome to the Firing Guidance System.
- Commence Data Accumulation...
- Gathering data.
Don't shake it. If we screw up now, it won't hit.
- Formulating Firing Curve...
Formulating Firing Curve.
- Forming as a Bezier curve.
This is filler, so please don't read it, okay? It's random.
All this English that I don't really understand sure is cool. Pretty awesome.
- Firing Preparations Complete
Firing Preparations Complete.
- If we shoot now, it'll hit.
...Assuming that the measurements are correct. Are we really good to go? It's totally automatic.
- Accuracy 97.89%