Queen's Blade (クイーンズブレイド, Kuīnzu Bureido?) is a series of visual combat books published by Hobby Japan, based on the licensed works from Lost Worlds. First published in 2005, it features only female characters in sexual art situations.
Beginning with the 7th series, it uses all-new game rules compatible with the Lost Worlds books.
This series also has a video game title on the PSP(Playstation Portable) "Queen's Blade: Spiral Chaos"
from what I have heard this game was only released in japan, but nonetheless makes it a great addition to the chan!