Queen’s Blade: Rurou no Senshi Episodes
A competition to decide the next Queen. The strongest warrior will rule the country and expand it. The contestants need to be older than 12. They need not be human, intelligent or even of that country. The rules for the tournament: murder is allowed. Any weapon can be chosen.
This is based on a series of visual combat books published by Hobby Japan which based on the licensed works from Lost Worlds. First published in 2005, it features only female characters.