Young princess Finé, the daughter of the Archduke of a small alpine country, travels to the neutral land of Westria to seek help against the Germanian empire that is invading her kingdom. But her plans go awry when she's captured by the Germanians, and transported by air back to their capital of Neu-Berlin. Then a strange light appears at the back of the plane, and a witch begins to awaken...

Izetta's victory has won a brief peace for the dukedom, and the princess intends to enjoy it. Together, they practice dancing, and go to a pie shop. But there's trouble brewing in the background, as young private Jonas has discovered her secret. How far is Seig willing to go to keep the country safe, especially when innocents are involved?

All is quiet in the dukedom as the Germanian army redirects its forces to deal with a coastal invasion by the allied forces. But the silence is suddenly broken by a deadly feint attack, and Izetta is sent to save the day. But when she arrives, she's met with another Witch! Who is this new witch, and can Izetta defeat her?

The capital of Landsbruck has fallen, and Izetta and the princess are chased into the mountains. As the imperial forces track them down, Seig makes Izetta an offer: he's willing to give her the other half of Sophie's magic stone. With this powerfulitem she fight toe-to-toe with Germania's witch, but it causes the user tremendous pain, and shortens their lifespan...

Germania has loaded a massive bomb with magical energy that threatens to destroy the entire Dukedom. It will launch soon, and the only way to stop it is to defeat Sophie. Using the magic stone, Izetta flies to Germania for one final battle.