600 Years after the "Resurrection Day", the earth has once again developed to the living standards of the 21st century before the "end of the world", although pollution such as nuclear explosions, wars and plagues have made the environment very different from before.
Huacha, on the other hand, is an unemployed vagrant who dropped out of college and was idle at home. In order to find a job, he came to apply for a job at a detective agency. For him, this place should only exist in novels.