Avenger (アヴェンジャー, Avenjā) is a Japanese sci-fi anime series produced by Bandai Visual, Bee Train and Xebec, and directed by Koichi Mashimo. The series premiered on TV Tokyo from October 1 to 24 December 2003. It was later licensed for North American distribution by Bandai Entertainment.
In a post-apocalyptic where Mars is now colonized, the majority of the human population divided up into a number of small domed city-states, while the remaining who live outside the domes in the harsh wildernesses are known as Barbaroi. The colonists have to rely on gladiatorial battles between representative fighters from each city to divide resources and supplies. Furthermore, no birth rate has appeared on Mars for a decade while the infertility cause remains unknown, and thus people turn to robot dolls as substitutes for children. The huge red moon from Earth orbits over Mars after the Earth's destruction and ravages the wasteland it with lunar storms caused by gravitational fluctuations between Mars and its unwelcome satellite.
Our story focuses on Layla, a barbaroi gladiator with a mysterious past and follows her quest to defeat Volk, the ruler of Mars. She is accompanied on her journey by Nei, a strange "doll", and Speedy, a doll breeder.