At the opening of space borders, a special force, made up of humans and extraterrestrials, is created to maintain peace between different peoples: the Gun Dragons. Agent Omega is not the same since her teammate Alpha lost his life in an attack on a Gun Dragon ship by the terrible witch Ursula and her right hand, Lucifer. Time does not erase her wounds and she takes refuge at work, multiplying her missions, when suddenly, during a stakeout on famous arms dealer Himmler, Ursula reappears…