Root√Double: Before Crime*After Days - Root After

The story is set in year 2030 where an incident occur in a giant research facility called LABO which has a nuclear reactor. The incident, which is the meltdown of the reactor locks everything in the facility causing 9 people, 3 rescuers and 6 ordinary people, to be locked inside it. They just have to wait to be rescued since help will come in 9 hours when the system will be recovered. The problem is... they only got "magic potions" against radiation for 6 people.

When disaster strikes an isolated research city, Captain Watase Kasasagi is deployed with his elite rescue squad to handle an underground nuclear reactor meltdown. Yet the disaster is not entirely what it seems. Radioactive contamination and massive explosions become the least of the squad’s concerns when the facility suddenly goes into complete lockdown—and they aren’t the only ones inside. Now they’re hearing voices, rescuing schoolgirls who shouldn’t be there, and finding corpses that had nothing to do with the meltdown! Will Watase be able to save the other survivors before it’s too late? Or will the voices make them turn on each other first?! Find out in this fast-paced survival thriller!