Queen's Blade (Japanese: クイーンズブレイド Hepburn: Kuīnzu Bureido) 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, it features sexually suggestive depictions of an exclusively female cast of characters. (There is particular emphasis on the large breasts of many of the contestants.) 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.