The Demon King and the Hero Became Out of Time

A young guy named Igusa, obsessed with all things "evil," gets reincarnated as the "Demon Lord" he always admired—only to end up in a seriously rough situation. The new world he's reborn into has been wrecked by an interstellar war, leaving both swords and magic in decline! He finally becomes the Demon Lord, but the planet he was supposed to conquer? Yeah, it's already on the verge of collapse... That's when a girl calling herself a "Hero" and a beast-eared girl from another world show up. Without hesitation, Igusa forces them into his ranks, grinning like a true villain. No land left to conquer? No problem. He'll just take over the entire universe!