This AU sets in the year 2020, where the whole world was radioactive and biohazard, as everyone such as Teachers, students and some others, live in an underground city bunker, known as Site-██, to avoid the radioactive waves and biohazard viruses on the surface. Teachers has taken on a new role to be scientists that work, test and learn about radiation and biohazard. Because Alice (or ↂlice) absorbed the radiation and biohazard, and corrupted the entire world in to radioactive waste land.