"Toys" are special abilities conferred on individuals chosen to utilize them, each with its own set of characteristics. Some of these people are born with supernatural abilities and use them to solve crimes. Others prefer to become phantom thieves after blooming with poison. These two warring groups spawned a slew of detective academies throughout the world, each teaching investigators to hunt down and apprehend the phantom thieves. "Milky Holmes" is made up of Sherlock Shellingford, Nero Yuzurizaki, Hercule Burton, and Cordelia Glauca, who are considered the top of the crop at the Yokohama-based Holmes Detective Academy. However, their Toys mysteriously vanish after a battle with the phantom thief Arsene, rendering them unsuitable to continue as investigators. They are put into a shabby attic, stripped of their distinguished existence.