We follow the story of a young girl named Akari, who after witnessing the murder of her father, has vowed an oath to find the killer and avenge his death. During the course of her journey, she meets Anino , an ex soldier who has been sent out with the task of finding a man known only as " The Boss". Rena , The head of security of Blacksign Arms and “The Boss”s personal bodyguard is a highly trained sniper formerly with the US . Special Forces. Akari is destined to interfere with her plans.