Youjo Senki

Youjo Senki (幼女戦記, literally "The Military Chronicles of a Little Girl") is a light novel series written by Carlo Zen and illustrated by Shinobu Shinotsuki. 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 von 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.

See here for more characters coming from this universe.