The Saga of Tanya the Evil, known in Japan as Yōjo Senki (幼女戦記, literally “The Military Chronicles of a Little Girl”), is a Japanese light novel series written by Carlo Zen and illustrated by Shinobu Shinotsuki. It began serialization online in 2012 on the user-generated novel publishing website Arcadia. Enterbrain acquired the series and since then has published nine volumes since October 31, 2013. A manga adaptation with art by Chika Tōjō began serialization in Kadokawa Shoten’s Comp Ace magazine from April 26, 2016. An anime television series adaptation by NUT aired from January 6, 2017 to March 31, 2017. A theatrical film taking place after the events of the TV anime series premiered on February 8, 2019.
An unnamed atheist Japanese salaryman, in the moment of being murdered by a disgruntled subordinate who he had fired due to poor performance at work, is confronted by a entity that could stop time which he refers to as “Being X” or god, who condemns the man for not having ‘faith’. He is sentenced to be reborn in a world that is similar to World War I Europe, mixed with early aspects of World War II and magic, in an empire torn apart by countless wars with all nearby countries. The salaryman is reborn as an orphaned girl, Tanya Degurechaff. According to Being X, if Tanya either does not die a natural death or refuses to have faith in Him, her soul will leave the cycle of reincarnation and will 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 the war, 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.
source : wikipedia.org