"The Military Chronicles of a Little Girl"), is a Japanese light novel series written by Carlo Zen and illustrated by Shinobu Shinotsuki.

A manga adaptation with art by Chika Tōjō began serialization in Kadokawa Shoten's Comp Ace magazine from April 2016.

Willing to avoid being killed whilst dying of natural causes, Tanya must take it upon herself to don a bloodthirsty, sadist ego in hopes of joining the ranks of the Empire’s Mage Corps as part of her plan to become a seemingly indestructible foe.

Saga of Tanya the Evil: The Movie, a theatrical film taking place after the events of the anime series, was released in Japan in February 2019.

The salaryman is reborn as Tanya Degurechaff, an orphaned girl in an alternate universe's equivalent of Imperial Germany, known as the Empire, in which World War I has been delayed until the 1920s and where magic has been incorporated into the military.

In search for an escape, Tanya decides to join the Empire's Mage Corps 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 lips, 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.

[10] On November 16, 2021, Yen Press released an audiobook of the first light novel, read by the English voice actress for Tanya, Monica Rial.

[23] A comedy crossover anime, Isekai Quartet featured characters from The Saga of Tanya the Evil in a Chibi style, much like the OVA.

It also featured characters from the light novel series KonoSuba, Overlord and Re:Zero − Starting Life in Another World, all published by Kadokawa Corporation.