In the hyper-technological, neon-soaked metropolis of Shizuka, the fragile balance of power is maintained by seven distinct "Kings"—charismatic leaders gifted with supernatural powers who command loyal factions of clansmen. The delicate status quo shatters when a
brutal murder video surfaces online, framing Yashiro Isana, a mild-mannered, amnesiac high school student, as the perpetrator. Though physically frail, Yashiro instantly becomes the most hunted man in the city, relentlessly pursued by the volatile, fire-wielding Red Clan, HOMRA, led by the brooding Suoh Mikoto, who seeks vengeance for the slain clansman.As the net tightens, Yashiro is rescued by the enigmatic Kuroh Yatogami, a lethal swordsman known as the "Black Dog," who initially sets out to test whether Yashiro is evil based on the legacy of his former master, the previous Colorless King. Recognizing Yashiro’s intrinsic innocence, Kuroh allies with him, alongside Neko, a playful, reality-warping "Stray" who possesses the ability to alter memories. Together, the trio goes on the run, trying to piece together Yashiro’s true identity while evading not only HOMRA, but also SCEPTER 4, the stringent, blue-uniformed order of police enforcers led by the stoic Reisi Munakata, who operates as the Blue King.The investigation unearths a far more sinister conspiracy orchestrated by the rogue, immortal Colorless King, who has possessed the body of the original monarch and now threatens to corrupt the sacred "Slates"—the mystical artifacts granting the Kings their power. As the supernatural tensions escalate toward a city-wide catastrophe, the Blue and Red Kings are forced into a volatile alliance, culminating in a tragic confrontation. Suoh Mikoto, slowly succumbing to the destructive nature of his own burning aura, confronts the possessing Colorless King, ultimately sacrificing his life to eradicate the threat and preserve the fragile peace.In
the aftermath, Yashiro’s forgotten past finally resurfaces. He discovers that he is not a normal human teenager, but the original Silver King, Adolf K. Weismann, an immortal German researcher who has wandered the earth for decades. With his memories fully restored, Yashiro embraces his divine destiny and reclaims his airborne sanctuary, the Himmelreich. He unites the remaining factions, vowing to protect Shizuka from future darkness while forever cherishing the bonds forged during his time as an ordinary boy.