After Becoming the Demon King, I Was Sent Back to the Blue Star of the Apocalypse

[The end of the world + no CP + no male protagonist + invincible Feng Aotian] This book is also called "About the fact that I was reincarnated as a beautiful girl devil and was sent back to the Blue Star in the end of the world" Illya Sophie was reincarnated into the world of swords and magic, and after years of struggle, she finally achieved enlightenment and became the Demon King. One day, she was suddenly teleported back to Blue Star by a mysterious beam of light, along with the castle. Along with her were the monsters living in the Demon King's City. Illya, who was just about to see if her relatives in her previous life were still there, discovered that Blue Star had entered the end of the world and the civilized order had collapsed. Most of the humans had turned into zombies and were no longer at the top of the food chain. So Illya, who was a human in her previous life, decided to protect humanity and restore order. Just... Illya felt a little headache looking at the monsters under her command who were clamoring for her to rule the world.