An atheist Japanese salaryman, in the moment of being murdered, is confronted by a self-righteous entity he refers to as “Being X” who condemns the man for not believing that “Being X” is God and sentences him to be reborn in a world that is similar to WWI Europe with magic, in an empire torn apart by countless wars with all nearby countries. The salaryman is reborn as a girl, Tanya Degurechaff. According to “Being X”, if she’s not able to die a natural death, or she refuses to have faith in Him, her soul will leave the circle and be sent to hell for the countless sins that Tanya has committed in her previous life. In search for an escape, Tanya decides to enter into the Empire’s Mages Division and fight in World War I, hoping to reach a high enough rank as fast as possible to remain far from the battlefield and in this way avoid the risk of being killed. Even if she’s now forced to speak with a young girl’s lisp, Tanya soon turns into a ruthless soldier who prioritizes efficiency and her own career over anything else, even the lives of those beneath her, especially those that get on her bad side.
主角是個超現實主義的菁英上班族，某天在在神的失控與強求之下轉生來到了異世界，這裡是運用魔導寶珠等魔導兵器且飄著硝煙的戰出世界；轉生來到異世界的他變成了名為 提古雷查夫 的她，帶著口齒不清的話語，幼女將徹底發揮才能與生前的知識來擊墜敵軍。