In the gripping visual novel Root Double -Before Crime * After Days- Xtend Edition, set in the year 2030, players are thrown into a catastrophic event within the isolated research city of Rokumei. Following a series of explosive incidents at the nuclear research facility known as “LABO,” an elite rescue squad named “Sirius” is deployed to handle the crisis. The situation escalates dramatically when the nuclear reactor undergoes a meltdown, resulting in a facility-wide lockdown, trapping both squad members and survivors amidst lethal radiation.

The narrative unfolds through two protagonists: Watase Kasasagi, a rescue captain suffering from amnesia, and Natsuhiko Tenkawa, a student unraveling the events of the days leading up to the disaster. Utilizing the innovative Senses Sympathy System (SSS), players influence the story not through traditional choices, but by projecting their emotions and trust onto the characters. This unique mechanic enhances the intensity of survival against mounting despair and uncertainty.

As players navigate the treacherous environment, they must piece together the truth and find a way to escape the confines of LABO, making Root Double a profound exploration of trust, memory, and the human condition in dire circumstances.