Eiyuu to Kenja no Tenseikon: Katsute no Koutekishu to Kon'yaku Shite Saikyou Fuufu ni Narimashita summary: 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