One day, while Al is on the hunt for "rebel dolls" - neglected fighting machines from a past war that have turned rogue - he comes across a peculiar sight. A boy, with handcuffs on, falls from the sky right in front of him and is chased by rebel dolls. As someone who seeks these machines as prey, Al is excited by the opportunity but soon finds himself questioning why the dolls are after the boy and whether he is even human. This discovery raises many inquiries for Al.