Overdevelopment and crowding in Japan has forced many of its indigenous spirits and ghosts to lose their homes. Due to problems caused by the homeless spirits, a new profession was created, the Ghost Sweepers (GS). Private exorcists for hire, they serve only the highest bidder to survive in the cutthroat corporate world. Among this, the Mikami GS Company, led by 20-year-old Reiko Mikami and her two assistants, the 17-year-old boy Tadao Yokoshima and the ghost girl Okinu, is said to be the best.