After a devastating war, the city of Arsenalia became the hometown of crime and the world decided to stop making guns, bullets and explosives and confiscated most of them. Klunker, a rogue assassin with no idea about his identity, steps into a new life after finding out about his special abilities. He decides to stay in Arsenalia after meeting a girl called Renai. But his past is haunting him leaving him no choice but to fight one last deadly battle to gain his freedom and find love.