Kimihiko Kimizuka has always found himself at the center of trouble and mystery. For as long as he can remember, he's always been accidentally stumbling across murder cases, or handing mysterious attaché for him to deliver. When he met Siesta, a brilliant detective secretly battling an organization of pseudohumans, he couldn't help but answer the call to become her assistant and embark on an epic worldwide journey. …That is, until a year ago. Now, he's returned to a life that feels normal and dull by comparison, accepting that their adventure has ended. After all, the detective is already dead.