Tanya Degurechaff, a soldier with the guise of a sweet young girl, conceals the heart of a cutthroat businessman who defied 'Being X,' the supposed God who reincarnated him into a magical industrial realm. Being X's aim is to demonstrate that even an unbeliever can turn to God in desperate times. Resisting the torment intended by Being X, Tanya joins the military yearning for tranquility. Her exceptional military skills earn her praise and promotions swiftly. Yet, as her nation plunges into a global conflict, her aspirations crumble. Striving to regain her peace, she unleashes brutal tactics on enemies. Thus unfolds the epic tale of Tanya the Evil and the Empire's quest for global supremacy.