LEVEL 1 DEMON LORD AND ONE ROOM HERO

After his embarrassing defeat at the hands of a brave hero, the Demon Lord is back and ready for revenge… but after ten years apart, the hero, Max, isn’t the dashing do-gooder the Demon Lord remembers. In fact, Max has turned into a shut-in slob with no interest in an epic rematch. Can the Demon Lord whip his former nemesis back into shape, or will he be defeated by the hero-turned-couch-potato once again and join him in his lazy life? (Source: HIDIVE) — Description from AniList community (anilist.co).