After humanity destroyed the Earth and itself, a young cheerful boy of the new breed decides to join the Angels: protectors of the new world order. But something goes wrong and he awakens a horrific beast in the depth of the Earth. He and his forceful AI companion meet an intellectual piano robot with a revenge streak that reveals that humanity still lives and wants to end the new world. Those three must work together to finish them off and reveal a horrific truth along the way.