You regain consciousness in a bunker. A red light is blinking. You find the strength to stand up. Soon, you remember that you have your trusty old revolver with you. As the story unfolds, it turns out that the gates to HELL are open, and it is entirely up to you to decide what happens next.

Will the protagonist run away from his problems and leave the planet to perish, or will he break into HELL and declare that humanity has no intention of abandoning this world?