This is a story set in Japan. The protagonist of the story - Kikutsu Mansho, is an outstanding young detective in Tokyo. His idol, the famous detective who once rescued him, Tetsuya Sakuraba, disappeared four years ago. Since his disappearance, Man Sheng's life has changed a lot. A group of children with genius minds walked into his life. Their collective name is "Demon's Children". Their leader is the youngest biologist in the history of biology, Irfan Lacebates.
There are 69 "Demon's Children" in the world, 15 are in Japan, and 7 are mixed race. What they have in common is that they suffer from some kind of terminal illness. Because their existence has a great impact on mankind, another organization "End's Alliance" will eradicate them one by one.
However, the final outcome is...