Amidst a corrupt land ruled by a merciless Prime Minister who has corrupted the minds of the Emperor’s army, including soldiers, assassins, and secret police, there exists only one force valiant enough to oppose them: Night Raid. The team's members are ruthless assassins, each equipped with a rare Imperial Arm - legendary weapons created in ancient times with unique and outstanding abilities. Rescued by the Night Raid from a life worse than death, young Tatsumi is given an opportunity to join the team, but it's a deadly choice. Only a handful are skilled enough to wield an Imperial Arm, and fewer still survive a battle of two Arms in combat. The battle for survival has commenced, and those who are strong enough will be the ones who make it out alive.