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 secret of Tanya's birth is revealed.

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 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.

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!

After her easy victory over Dakia, it's time for a more difficult mission: aiding the destruction of the Entente Alliance to the north.