The novel series centers on a young girl who fights on the frontlines in war. She has blonde hair, blue eyes, and nearly transparent white skin, and she flies through the air and mercilessly strikes down her opponents. Her name is Tanya Degurechaff, and she speaks with a young girl's lisp and commands the army. Tanya used to be one of Japan's elite office workers, but because of a wrathful god, was reborn as a little girl. Tanya prioritizes optimization and career advancement above all, and she will become the most dangerous entity among the Imperial Army's sorcerers. 
 
(Source: Anime News Network)

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! 
(Source: Yen Press)

Chibi parody of Youjo Senki. 
 
Includes Episode 0.

In 1926, Tanya and her battalion return home from defeating remnants of the Republic's army. However, when they arrive they receive word of a massive mobilization near the border with the Russy Federation, so the Empire's army must prepare. At the same time, a multinational army under the leadership of the Allied Kingdom moves into the Russy Federation. The enemy of an enemy is a friend, but among the Allied Kingdom army is Mary Sioux, a girl who has sworn to exact justice against the Empire for the death of her father. 

(Source: Anime News Network)

The button appeared out of nowhere. There weren't any signs NOT to push it... so the solution is obvious, right? Is it a trap or the start of something new and exciting? The crews of Re:Zero, Overlord, Konosuba, and The Saga of Tanya the Evil will find out when they go from their world to another and get stuck in... class?! See what adorable chaos they'll get up to in this collection of shorts!
 
(Source: Funimation)

The second season of Isekai Quartet.
 
Your favorite isekai characters return for more exciting crossovers in our everyday world! This time the Shield Hero joins in, and he’s brought Raphtalia and Filo along with him. What kind of shenanigans will the crews of Re:Zero, Overlord, KonoSuba, Saga of Tanya the Evil, and now, The Rising of the Shield Hero get into together? 
(Source: Funimation)

What would an ultra-rational Japanese salaryman do if he was reborn as a girl in a world where magic was real? Obviously, become the Empire's most feared magic soldier, while climbing the army career ladder at the ripe old age of nine. The only things standing in Tanya Degurechaff's way are a world war and maybe a supernatural being or two. But Tanya isn't about to let artillery shells or deadly spells stop her when a cushy desk job is calling! 
(Source: Yen Press)

The 203rd Air Mage Battalion led by Tanya is forced to fight in the southern desert, the front line. In an effort to provide some food for the harsh conditions, Colonel Rerugen sent dried pasta to the battlefield. Will Tanya and the others be able to eat the delicious pasta under the conditions of water shortage? 
 
(Source: Abema, translated)

The homeroom class gets sucked through a wormhole into - you guessed it! - another world where they encounter a desolate environment dominated by a rampaging magical automaton. There they meet a girl-type golem with mannerisms similar to Megumin, a woman dressed in the same military uniform as Tanya, and a man with a cane who seems to know Subaru, and hijinks ensue. 
 
(Source: Crunchyroll)

The third season of Isekai Quartet.

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