Footsoldier D is a shapeshifting monster with a burning grudge and a legacy of forced humiliation. Also known as *Sentai Daishikkaku* or *Ranger Reject*, this electrifying series reveals that the world’s most beloved heroes, the Dragon Keepers, are actually the orchestrators of a massive fraud. For thirteen years, D and his fellow "Dusters" have been trapped in a cycle of scripted defeats, serving as nothing more than weekly target practice for the public’s entertainment. Refusing to spend eternity as a glorified punching bag, D takes a desperate gamble by disguising himself as a human to infiltrate the very organization that has turned his existence into a cruel joke.

Surviving the cutthroat Ranger recruitment program is a trial by fire where every mistake could lead to D’s exposure and immediate execution. The mission takes a fateful turn when he is forced to swap identities with a sympathetic cadet named Hibiki Sakurama, plunging him into a high-stakes double life where he must balance his monstrous nature with the unexpected bonds he forms with his "enemies." Facing the terrifying might of the Keepers’ Divine Tools and the internal rot of the Ranger battalions, D must navigate a world of moral gray areas where the line between hero and villain is blurred. Yet, despite the overwhelming odds and the constant threat of discovery, he remains driven by an unwavering dream: to topple the five Dragon Keepers and finally secure true freedom for his people.