Unexpectedly summoned to the world of Aletia from modern-day Japan, Hiro Oguro soon discovers this isn't his first visit. As the legendary Hero King Mars, he once ruled battlefields, conquered nations, and founded the continent-spanning Grantzian Empire before giving up all memories of his hard-won glory to return home to his old life. Now he's back, a thousand years after he left, and his legacy is in peril. The Grantzian Empire creaks under a warmonger's rule while ambitious royals squabble for power and foreign nations sharpen their swords. After a chance encounter with Princess Elizabeth von Grantz draws him into a cutthroat struggle for imperial succession, Hiro must don the mantle of the War God once more. Can he live up to his own legend now that Aletia needs him again?

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The Grantzian Empire faces its darkest hour. To the south, the Vanir Triumvirate and the Free Folk march to war. To the north, the treacherous House Brommel schemes to overthrow House Scharm, its supposed opportunism concealing a far more malign and ancient darkness. Hordes of monsters beat upon the wall of Friedhof and none come to its aid. Soon, the curtain will rise on a climactic battle for the fate of Soleil. Yet first comes a prelude. Far to the west, Liz and Hiro meet once more-not as allies but as foes. When Lævateinn clashes with its fellow Spiritblades, who will emerge victorious?