Four teenage girls are abducted, kidnapped, and tortured. Designated by numbers on their skin with a hot iron, young girls are ranked in the evening. The one that finishes last will then be punished if her friends fail to solve a puzzle…

Miho is a high school girl who is kidnapped by a mysterious "school" and trained as a slave. She is left unsold at the auction and is saved by a man named Yamamoto on the verge of being “disposed of”. Yamamoto is spying on the trafficking organization in search of his missing lover. Meanwhile, Izumi, Asuka, and Saki, who were bought at the auction, are subjected to hell as toys for perverted customers. Yamamoto kidnaps a buyer named Arikawa who won the bid for Izumi. He threatens the organization, but the operation backfires and he is captured with Miho. Miho, Yamamoto, and Izumi are gathered in an underground execution site by the school and are made to participate in an online murder show using a high-voltage current stick. Who will kill their friends to survive? The last game has begun!