It will be a sequel of the events on the anime
On the pages of Kadokawa´s NewType magazine it has been revealed that a movie based on the property of “Saga of Tanya the Evil” is being worked on; unlike how at start one would think, the movie is not a recopilatory one; but rather a sequel of the events that happened on the anime.
Yutaka Uemura (The director) revealed that there where no plans for any movie after the anime ended; but thanks to the fan support this project was greenlit, at the same time he revealed that the movie might have some influence coming from Christopher Nolan´s Dunkirk, mostly because its a movie the director saw recently.
Also the twitter of the series revealed that on the second chapter´s rerun of the anime there will be an important announcement.
Yen Press is publishing the light novel and manga adaptation and it describes the story as follows:
“High above the blood- and mud-soaked trenches, a young girl pits herself against army mages in high stakes aerial duels with bullets, spells, and bayonets. Her name is Tanya Degurechaff and she is the Devil of the Rhine, one of the greatest soldiers the Empire has ever seen! But inside her mind lives a ruthless, calculating ex-salaryman who enjoyed a peaceful life in Japan until he woke up in a war-torn world. Reborn as a destitute orphaned girl with nothing to her name but memories of a previous life, Tanya will do whatever it takes to survive, even if she can find it only behind the barrel of a gun!”
Via: Anime News Network