On the front lines of the war, Tanya Degurechaff, blond hair, blue eyes, and porcelain white skin, commands her squad with lisping voice. Actually, she is one of Japan's most elite salary men, reborn as a little girl into a world of magical warfare after angering a mysterious being who calls himself God.

The Empire is a powerful military nation on a continent that looks much like early 20th century Europe. But in this world, magic is real. The Empire is involved in a war against the Entente Alliance, and fighting a poorly executed delaying action in the northern theater. Second Lieutenant Tanya Degurechaff leads a small platoon of mages. But there's something unusual about this lieutenant... she's only nine years old!

The Devil of the Rhine

The secret of Tanya's birth is revealed. Tanya was a cold and unemotional Japanese salaryman who was pushed in front of a train by a man he laid off. An infuriated godlike creature named "Being X" sent him to this world, and reincarnated him as a baby girl... with no promise that he would ever be reincarnated again. Now Tanya has to survive, because this is all she's got!

Prologue

After her stunning success with her first mission, Tanya is assigned to test a new piece of technology: a highly unstable prototype calculation jewel. This jewel offers her unparalleled power, but just using it risks her life. Tanya is determined to get out of this project and on to someplace easier and safer (like the front lines of the war), but Being X has other ideas...

Deus Vult

Tanya is now living life on easy street, as a highly-respected student at the military university. She's so highly respected, in fact, that one of the Empire's chief military planners asks her for her opinion on the course of the war. Eager to show off her intellect (and hopefully land herself a cushy job in the planning department), Tanya comes up with a plan of astonishing insight and intelligence. Her idea backfires, however, when she turns out to be a little too smart for her own good...

Campus Life

Tanya's new battalion is off the ground and running, and it's time for them to do their first mission: fight back a massive invasion by the Dakian Dukedom to the southeast. The enemy army numbers in the hundreds of thousands, but they've brought no air units at all, which makes them easy pickings for Tanya's highly trained force. After wiping out the enemy army, she heads straight for the enemy capital and launches an attack there.

My First Battalion

After her easy victory over Dakia, it's time for a more difficult mission: aiding the destruction of the Entente Alliance to the north. The Alliance is being backed by the strong powers, and has equipment and training that in some cases rival the Empire. When Tanya arrives, the Alliance is striking a critical supply base with a bombing raid, and the local Empire force are too overwhlemed to defend against it. Can she get there to hold them off in time?

Beginning of Madness

The Empire is launching a seemingly foolish attack on the Entente Alliance in the middle of winter. They lack the supplies to successfully invade. Tanya realizes that this attack is a feint intended to distract from a fjord landing mission. Sure enough, she is sent to lead the invasion of the fjords, and silence 20 cannon emplacements in time for the fleet to land and the Imperial forces to disembark.

The Battle of the Fjord

The war with the Entente Alliance is done, and it's back to the Rhine for Tanya and her forces. The Republic troops are highly trained, well-equipped, and stronger than any she's faced before. And in a distant hospital, a former Kingdom officer wakes up, with a mission from God imprinted on his mind...

Trial by Fire

The last enemy on the continent is the Republic, and the Empire has come up with a bold plan to take them out. Of course, Tanya is sent to the forefront of this operation, and is forced to take on the entire Republic army by herself while the Empire stages a faked withdrawl. Then it's off for a ride on a rocket as she heads straight into the heart of enemy territory!

Preparations for Advance

Tanya's spectacular mission is a success, and the Republic is surrounded and crippled. But on her way back, she runs into a group of allied mages, lead by Anton Souix, the man she crippled once more. He's back, and powered by Being X, and his one mission in life is to take down the Devil of the Rhine!

The Path to Victory

Tanya's diminished smaller company attack the battalion of Allied Kingdom mages rather than retreat. Their company use their altitude advantage but suffer heavy losses, especially when Colonel Sioux uses an illegal Trench Gun.

Resistance

Tanya just barely manages to restrain herself from disobeying her superior officers and attacking the Republic remanents. But the Republic forces have escaped overseas, and vowed to fight to the bitter end. The Empire has been victorious, but in its victory it has terrified the rest of the world and spurred them to action. Is true victory possible at all?

How to Use a Victory

Tanya is put in charge of a combat team fighting on the Eastern front.

Salamander Combat Team

Tanya comes up with a plan to stop the attacks on her unit.

A Strange Friendship

An ally comes up with a plan to end the war.

Well-Intentioned Mediator

The Empire goes all-in on a plan to break the Federation army once and for all.

Operation Iron Hammer

Zettour is reassigned to the eastern front after an argument with High Leadership.

Unlucky Draw

Zettour uses himself as a decoy to lure out the enemy and save Tanya.

Decoy

Tanya returns to the capital and sees what daily life is like there.

Purgatory

Tanya uses a new type of torpedo to save her allies in the south.

Torpedo Strike

Tanya enjoys a wonderful day in Ildoa before returning to the Empire.

Sightseeing Tour

The Empire turns to diplomacy to end the war.

A Way to Survive

Time is running out for the empire, and both Rudersdorf and Zettour are willing to take drastic measures.

Hourglass

Tanya defends Rudersdorf's plane from an assassination attempt.

Saga of Tanya the Evil

Episode · Musim 1