Black Ring Culture

The cold-blooded Demon King who has beaten all his enemies, who has always been second to none, ended up losing all his magical powers to a female hero who hexed him. What is this magical ritual that you do with the opposite sex’s lips? I can’t believe that even I, the formidable Demon King, have been defeated by this mysterious move! But no worries, I can retrain my abilities. It doesn't matter if you’re a succubus, an elf, a beast woman, or a noble hero’s descendant. I’ll use you as my training partner if I can help it. In order to revive the demon race, I’ll show you the Dual Cultivation Method!

Despite his ordinary skills, Sir Shake, captain of the guard, dedicates his life to defeating the demons and bringing about an era of peace with the immortal swordmasters. However, when Shake finally succeeds and also becomes a swordmaster, he dies, only to reincarnate 20 years later as Asher. He's shocked to find that his comrades have vanished and demons are rumored to have returned. In the midst of all this chaos, can Asher find his former allies and vanquish the enemy for good?