4 parts Ongoing MatureThis story involves twins, a brother and a sister, Shinji and Eri, against the world. Originally created to be armed reconnaissance robots, the world's greatest Doctor with some secret tie-ins with his past, Satoshi Sera, programs and designs them to act and look more like human children. They can feel emotions, instincts, etc. Still they keep their superhuman abilities, and can live their lives like almost regular children.