A ghost named Fuurouta plays a prank on a class trip, freeing a prized green beetle from its cage while a mysterious black fog rolls through the area. Shortly after the incident, the black fog settles on the Japanese Diet building as the Superhuman Bureau restrains Fuurouta, unsure of what to do with him. While escaping from captivity, Fuurouta runs into a strange girl named Campe and offers to be friends with her...