A short story series by "Carlo Zen (カルロ・ゼン)":http://twitter.com/sonzaix that was originally "posted online":http://www.mai-net.net/bbs/sst/sst.php?act=dump&cate=tiraura&all=24734 beginning in 2012 and later collected into "a paperback novel series":http://www.amazon.co.jp/dp/4047291730/ by Enterbrain.

An anime adaptation aired from January 6, 2017 to March 31, 2017, produced by the studio NUT. The series was followed by a film that premiered on February 8, 2019.

A small, cute young girl named [[Tanya Degurechaff]] mercilessly terrorizes the skies; in reality, she is one of Japan's most elite salarymen, reborn as a little girl thanks to the whims of God. Will Degtyaryov become the most dangerous member of this magical world's elite imperial guards?
幼女戦記