Start with the Demon King and Unfreeze the Demon King's Castle from the Beginning!

[Multiple female protagonists + invincibility + historical fault + dimensionality reduction attack + big boss escort] At the beginning, Ye Yu traveled through time and became the Demon King. But the entire Demon City has long been exiled outside of time. Thirty thousand years have passed in the real plane, and the Demon King has long been forgotten in the long river of history. There is no perfect path for man, and his last prayer created a bridge between time and space for him. Imperial hunter? He's on par with my miscellaneous fish and skeleton soldiers! The kingdom's regular army? Look at my big hell dog chewing chew! Saint magician? Go talk to my succubus general! The devil has returned to reality, and some people are happy and some are worried.