Queen's Blade is a series of visual combat books published by Hobby Japan based on the licensed works from Firelight Game Company's Lost Worlds. First published in 2005, the overall plot of the game revolves around a tournament called the Queen's Blade, which is held once every four years to determine a Queen. Since its original release, this title has evolved into a media franchise, spanning four manga adaptations, three anime adaptations, three light novels, and a video game adaptation.