The ruthless Minister Honest exploits the ignorance of a new young Emperor, deviously ruling the country from the shadows with twisted morals and no regard for human life. As a result, an epidemic of crime and corruption has spread throughout the capital city, leading to a society where the privileged hold absolute domination over the lesser. However, an organization exists to combat this rampant abuse of power: Night Raid, a secret division of the oppositionary Revolutionary Army. It consists of a small team of ruthless assassins who murder all those who participate in or turn a blind eye to the Empire's outrageous wrongdoings. Tatsumi is a naïve, sword-wielding young man on a journey to save his impoverished village. Soon, he witnesses the bloody horrors and cruelty of the capital firsthand. Overcome with hatred, Tatsumi is swayed by Night Raid's profound cause and decides to join them, embarking on a painful and dangerous mission to exact revenge on Minister Honest. Tatsumi gains many invaluable experiences as he unravels the ethics of conflicting ideologies, life and death, all while working toward the restoration of a humane world.