Root Double -Before Crime * After Days- Xtend Edition is an immersive adventure game developed by Regista. Set in the year 2030, the game takes place in a research city called Rokumei, where the nuclear research facility known as “LABO” experiences several explosions. The survivors, including members of the elite rescue squad “Sirius,” are trapped inside the facility after a nuclear reactor meltdown. As the radiation levels continue to rise, the survivors must work together to uncover the truth and find a way out of the facility.

The game features two different protagonists, each with their own story: Watase Kasasagi, a rescue squad captain who has lost his memories in the hours after the incident, and Natsuhiko Tenkawa, a student piecing together the clues in the six days before. The story is shaped by the player's emotions projected onto the characters, particularly their trust in them, using the unique Senses Sympathy System (SSS). With no clear-cut choices, the game allows the player to manipulate the story purely based on emotion. The game's immersive storyline and innovative gameplay mechanics make it a must-play for adventure game fans.