Kei's arm isn't a power waiting to be unlocked, it's a time bomb disguised as salvation, and the show knows the difference. Every scar tissue conspiracy, every organization closing in, every moment he realizes what the doctors actually did to him when he was five years old feeds a single question that gets uglier the closer you get to the answer. The mystery isn't "what is the arm," it's "what did they turn me into when they saved my life," and by the time you understand, you've stopped trusting anyone claiming to help him.

As a kindergartner, a boy suffers an accident that badly mangles his arm, yet his doctors somehow manage to save it. Several years on, strange events start to gather around that arm, and it proves to be far more than an ordinary limb. At the same time, a secret organization sets out to capture him and seize the power he holds. The TV series runs 26 episodes and mixes action, fantasy, mystery, sci-fi and thriller.