Lux Arcadia is a disgraced former prince of the fallen Arcadia Empire, overthrown in a revolution. To survive, he works as a handyman in the new kingdom of Atismata, taking odd jobs to pay off the empire's massive national debt. While fleeing a collapsing roof during a job, Lux accidentally crashes into the royal bathing quarters and lands on Lisha Airthean, the haughty princess of Atismata. This scandalous meeting forces Lux into a public Drag-Ride duel with Lisha. Drag-Rides are ancient, armored mechanical weapons extracted from ruins, traditionally piloted exclusively by noble females. During the intense battle, Lux showcases anomalous, god-tier combat skills, effortlessly defeating Lisha without ever activating his own Drag-Ride's offensive capabilities, earning her immediate fascination.Following the duel, Lisha’s uncle enrolls Lux in the exclusive Swarmia Academy, an elite institution where noble girls train to pilot Drag-Rides. As the only male student in a school of hundreds of proud young women, Lux faces severe suspicion, hostility, and gossip. His primary goal, however, is not social acceptance, but rather to uncover the dark truth behind the revolution that destroyed his family. He hides a terrifying secret: he is the legendary "Black Hero," the pilot who single-handedly brought down the old empire. Despite trying to maintain a low profile, Lux is relentlessly drawn into conflicts. He repeatedly rescues his classmates—including the timid knight Krulcifer Einfolk, the fierce noble Celisworth Yormungand, and his own devoted adoptive sister Philuffy—from deadly attacks by rampaging Abyssal Beasts and rival political factions.As Lux forms deep bonds with these young women, opening up about his
traumatic past and tragic motivations, the true scope of the
global threat becomes terrifyingly clear. He discovers that the Abyssal Beasts are not mindless monsters, but genetically engineered weapons tied to the dark secrets of the old Arcadia Empire and an impending apocalyptic event. Lux must reconcile his deep-seated guilt over the past with his fierce desire to protect his new friends and the fragile peace of Atismata. Teaming up with his academy peers, who now fiercely trust and care for him, Lux embraces his legendary mantle once more. He utilizes his unmatched tactical genius and a forbidden, immensely powerful custom Drag-Ride to wage war against corrupt nobility, monstrous threats, and the ghosts of his own lineage, fighting desperately to secure a truly undefeated future for everyone he holds dear.