Stephanie Allen, a businesswoman once plagued by misfortune and unfairness, sacrifices her life to save a child in a tragic accident. Instead of finding peace, she awakens in a strange, oversized world filled with gigantic weapons and brutal mercenaries: the RED, BLU, GRN, and YLW teams—rival factions constantly at war.

Living like a borrower in the year 1972, Stephanie hides within the walls of the various bases, avoiding detection and adapting to her bizarre environment. However, her survival instincts evolve as she learns of a greater threat looming over Mann Co. A force so powerful that it could annihilate everything.

Stephanie, now gifted with newfound powers, must step out of the shadows, navigate the deadly world of mercenaries, and stop this impending force before it’s too late.