Hamel was the fiercest mercenary companion of the Great Vermouth, fighting side by side through countless battlefields across decades to vanquish four of the five Demon Kings threatening humanity. Facing the final Demon King of Destruction, Hamel sacrifices his life to shield Vermouth, dying with the bitter regret that he could never surpass his legendary friend. Three centuries later, Hamel awakens reincarnated into the body of Eugene Lionheart, a descendant of none other than Vermouth himself. In an era of artificial peace where Vermouth is worshipped as a divine god and the Lionheart clan stands at the apex of imperial prestige, Eugene discovers shocking historical inconsistencies: the fifth Demon King was never slain, and an ancient covenant was struck behind closed doors. Retaining his battle-hardened mercenary instincts, peerless mana comprehension, and fiery tenacity, Eugene picks up the sword once more. Determined to surpass his ancestor and finish the crusade he started three centuries ago, the reincarnated legend begins his march....more