After encountering Dr. Stein at Kreutzer's hospital, Black Jack follows Dr. Stein to his hospital in Germany where he is a leading expert on prosthetic limbs and organ transplants. Jack encounters a colleague, Dr. Konomi Kuwata (a.k.a. Black Queen) who mentions that Dr. Stein is about to perform an operation that would attach an experimental robotic arm to the boy Triton, an aspiring pianist who has Ewing's sarcoma. Jack fails to get any answers from Dr. Stein, but he does talk to the boy who would rather keep his human arm and learn to play the hard way...