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Official Site: ARMS

is a series of visual combat books published by Hobby Japan based on the licensed works from Flying Buffalo's Lost Worlds. First published in 2005, it features sexually suggestive depictions of an exclusively female cast of characters. The overall plot of the game revolves around a tournament called the Queen's Blade, which is held every four years to determine a Queen. Only young women who are considered beautiful in their hometown are allowed to enter.

The series later evolved into a media franchise, spanning four manga adaptations, three anime adaptations, three light novels, and a video game adaptation. The series is later followed by a sequel called , featuring all-new characters as well as remakes of previous characters, and a supplement called , featuring licensed characters from other games and series. Figures of the characters made by various manufacturers, such as Kaiyodo with their Revoltech series, have also been produced along with several memorabilia.

Beginning with the 7th series, it uses all-new game rules compatible with the Lost Worlds books. At Anime Expo 2010, Hobby Japan announced that they will release English translations of the gamebooks in North America in the near future.

In the Continent, a tournament called the Queen's Blade is held every four years to determine the most beautiful and powerful Queen. Held in , the Queen's Capital, various fighters from all over the Continent travel to the Capital to defeat Aldra, the current Queen. The overall story of Queen's Blade focuses on Leina, the heiress to Count Vance and next in line for the throne, as she travels to Gynos, encountering many other warriors also competing in the Queen's Blade for their own intentions.

Queens Blade Universe has not been a contender in any CBUB matches.