He was reborn as a German company commander, but led his troops in a mutiny an hour before the armistice.

He changed his mind about the assassination attempt, saving the revolutionary heroine, Rosa, from peril.

He founded the "Red Front," becoming the Nazis' most feared enemy.

"I'm not here to join history, I'm here to rewrite it."

—Karl Wegner

In 1918, desperate Germany wept. A spirit from the future brought it the only answer.

This is an unimaginable path, an epic tale of ideals and iron will.

The path has been shown.

Travel back in time to 19th-century Greece and witness his rise from a small Balkan nation. Lead Greece to its great ideals, restore the glory of Rome, and make the name of "Rome" known from Ireland to Khitan! And this is Constantine, the only sun of the Balkan Peninsula, the heir of Komnenos, the second Aristotle, the world's restorer, the Turkic butcher, and the loving father of the Roman people: Rome has only one chance to be revived. If you don't seize it, then let me do it!

Tsar Peter the Great of Russia, Augustus the Strong of Saxony, King Christian of Denmark, Frederick I, the "Soldier King" of Brandenburg... Across the European continent, countless enemies aimed to crush the hegemony of the Swedish Empire. In the face of powerful adversaries, the Swedish King Karl XII—who hails from a future era—tells his soldiers: "Victory or death."