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…

There is a "school" that abducts and confines girls to re-educate them as sex slaves. Kyoko, a bad schoolgirl, was caught by a witch and turned into student number 55. Life in the school is hell where repeated torture, ill-treatment, and rape is called "re-education". However, Kyoko has a hidden purpose. She was trained by a secret organization called Onesti and infiltrated the school as a spy. Her mission is to retrieve top secret data from the trafficking organization and release the captive girls. Kyoko works with classmates Yuka, Yuma, and Yui to formulate a detailed escape plan. Finally, the day of their jailbreak has come...

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!

Kyoko was the only one who succeeded in escaping the "school", but an unknown virus was injected into her body that will kill her if left untreated. The only way for her to survive is to go back to the "school" and take their vaccine. Meanwhile, Yuka, Yuma, and Yui, who failed their escape attempt, are undergoing brainwashing in the form of severe torture and electric shocks. On the day of the trafficking auction, Onesti armed troops attack the school. There, Kyoko reunites with her transformed classmate. After the fierce battle, can the girls live and escape from this hell?

It’s been a year since the “school” where captured schoolgirls were trained as sex slaves was destroyed. But a survivor, Arikawa, has planned to rebuild the school by using Chiaki, the former Number 66, who’s a daughter of the principal. His first objective is to kidnap a good female teacher to brainwash her into becoming the school’s star trainer. When Arikawa kidnaps his targeted high school teacher, Mitsuko Sawamura, Chiaki thoroughly humiliates her into a corner in confinement. When Mitsuko finally loses herself, her brainwashing is successfully completed – or so it seems.

The day of human auction has come at a dreadful “school” that has been reopened. Among the “products” on the stage, there is Yuuki, with a given number 77, whose memories have been brainwashed out of her. When the auction comes to its climax, an armed band of robbers pours in to lock auctioneers and those up for sale alike in the basement. As a time bomb is set off, the robbers’ lusts are driven into madness. While a storm of rape blows, the effects of Yuuki’s brainwash lifts and her memories are back, with the story heading to a most unexpected ending.