In the far future. Medicine and mechanics allow cyber prosthetics to be possible. A respected figure in both fields takes a leap of faith. The recovery of muscle tissue and skin is mere theory, as he disappeared from the public eye, no one knows for sure. An unknown party is after this knowledge. The only daughter of this scientist is their target to drag him out. An amnesiac young boy is assigned as her bodyguard working with a paramilitary organization. Little will the world know he is the first successful patient in said treatment. His name is Jin Tsurugi.