Having been released from the detention facility, Geeko, Nero, Bakutani, Nemesis, and the other reanimated girls have been rehoused at Beniyuri Academy. While the girls frivolously spend their high school days, they know in their hearts that they are not truly free. When one of their own, Regan, goes missing after being summoned by the headmistress, Geeko goes to the source to investigate. What horrible fate befell Regan, and how far will Geeko go to protect the school lives of her friends?