Even the Demon King is worrying about another world today.

<Invincible Throughout> <Many Problems at the Beginning, But It's Actually Great Later> He was a failed ruler, and the masses were on the verge of extinction under his rule. As the world was about to perish, the Demon King fled with his apostles. Being used by a human princess, having his bed climbed into by a beast-eared loli, being seduced by a succubus older sister, being bewitched by a dragon mother, being forced into marriage by a saintly angel—these were all minor incidents! The Demon King, who had seen it all, wasn't worried at all! To prevent himself from ruining the world again, the Demon King was extremely worried.