In a dystopian near-future, a young man named Boy is rendered mute and deaf after traumatizing childhood events lead to the murder of his family. Stripped of his senses, Boy is taken under the wing of a shadowy figure known only as Heller, who trains him to become a lethal warrior. Boy's enhanced reflexes, combined with his heightened other senses, transform him into an unstoppable force. As he grows up under Heller's rigorous tutelage, Boy's sole focus becomes avenging his family by targeting the people responsible for their deaths, the tyrannical Krieg family, who reign over the city with an iron fist.

Driven by vengeance, Boy meticulously plans his attack against the various key members of the Krieg empire. Along the way, he encounters several allies with their motives against the Krieg family, including the resourceful scout Jayne and the enigmatic healer Miriam. Together, they navigate the perilous urban landscape, filled with danger at every corner—whether from the Krieg family's heavily armed enforcers or from the city's volatile inhabitants. As Boy inches closer to his ultimate confrontation with the Krieg family, he discovers hidden truths about his past and uncovers deeper conspiracies that challenge his perception of justice and vengeance.