Missing 55 Final Break by Yasushi Koshizaka

3.80

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?