Kizumono no Gakuen 2 ~Case of Saint Spica~

We used to live a boring life, boring class, conversations with friends.... But one day, a big earthquake strikes and destroys everything. We can't go out and have no way to contact with the outside of school building... confined.... We start to look for the way to get out.... But several missing cases happen and all the girls who come back have been raped.... Extraordinary situation drives us mad and.... There is no way out....