英雄と賢者の転生婚～かつての好敵手と婚約して最強夫婦になりました～

With their nations in conflict, the Hero Reid and the Sage Elria had long been on opposing sides of the battlefield. However, it would all come to a much too sudden end with the Sage's passing. Single-handedly breaking through the enemy ranks to see Elria one last time, Reid meets his own heroic demise... But then, he opens his eyes as a newborn a thousand years later, getting another chance at life…and love?! (Source: Manga UP! Global)