60 years ago, an unprecedented "insomnia" struck the world. People who couldn't sleep became mentally ill one after another. Suicides and serious violent incidents occurred frequently, becoming a major social problem. Although the situation gradually stabilized with the development of new drugs, the side effects of the drugs caused 2 billion people to fall ill, and new life forms such as "blood-thirsty species" were born from time to time. After that, the war between "blood-thirsty species" and humans broke out. Although it ended with the victory of humans, the remaining blood-thirsty species still exist in this world... In the end, humans relied on artificial blood and the blood-thirsty species management system called "D-GPS" to protect the survival rights of blood-thirsty species. This story takes place on the stage of daily life where humans and blood-thirsty species coexist.