In the near future the political system of Japan had become a monarchy, and then the king enacted the law of shooting license. The triggers who were arranged in each prefecture and Tokyo were permitted to shoot unconditionally. They shoot the one whom they judged as evil by their firm belief. This is the ultimate hard-boiled action cartoon. (Source: Jitsugyo no Nihon Sha)

Four years after the end of the One Year War between the Principality of Zeon and the Earth Federation, Cain Ragnard, a war orphan whose parents were killed by Zeon's attack on Side 7, has joined the Earth Federation Forces. For the vengeance of his parents, Cain joins the special force Shadows to hunt down the remnants of the Zeon menace. One day his team is sent to Earth to eliminate Zeon remnants in the Middle East, however, an act of betrayal changes everything...