The Demon Lord reincarnated and became the... Caretaker of a kindergarten?

Prologue

(A/N Notes: Dramatic narration voice sound effect ON!)

The demon lord Cryselys was the strongest demon lord to ever rise to power, Cryselys would unify all the demon tribes on the demonic continent and then launch an invasion on the human continent

And yes this is just a generic fantasy web novel starting prologue number 4578, anyways...

Cryselys' troops would go on to conquer and plunder half of the human continent, the demon horde appeared unstoppable, then in an act of desperation the strongest human nation, did some magic thingamajig or asked the gods for it, I don't care how they got it but they went, and, got themselves a hero, the hero... Hmmm... The hero John! That is what I will call him as, even though that probably won't be his name. John Hero! That's how everyone called him as

The hero, John Hero, would go to singlehandedly push back the demon horde, how? I don't know either, he just did. With the demon army retreating back to their initial conquered territories, Cryselys would finally set foot on the human continent for the first time since the invasion, Cryselys was intent on getting rid of the hero before the invasion was completely pushed out of the continent

Then on the battle of the plains, because I don't want to think of a better name for it, it would be there that the demon horde would make its last stand on the continent and the demon lord Cryselys would fight the hero John Hero

"My demon lord, as you can see, all of our troops are extra motivated with your presence here. Today we will surely win against the hero!"

One of the three great demonic generals, why three? Because it shall be three, no more, no less. Three shall be the number of generals, and the number of the generals shall be three. Four is too generic to use, neither it will be two, except when we proceed to three. And five is right out.

"Excellent, today our battle will be legendary!"

Cryselys could feel the ecstasy of being on the battlefield for the first time after long years of staying in her throne room like most demon lords in other web novels. And that was also the first time all of the soldiers ever saw their ruler in the flesh, Cryselys gorgeous face, and body alongside her magnificent horns were a delicacy to the eyes of the demonic soldiers, her beautiful wings proudly being displayed to all the onlookers, and her fluttering and wavy red hair

No matter how they saw, there was no way for the demon lord Cryselys to lose

"... So where's the hero and human army?"

"We don't know, my lord. In fact, we have no idea how the hero operates since there were no survivors in the battles he was part of"

"That's concerning -! Move out of here now!"

"Wha-"

Faster than anyone could see, Cryselys disappeared from the chair she was on just seconds ago, located on the top of a hill. Then just a few mere moments later, the hill was obliterated by something hitting it. The great demonic general who was standing next to Cryselys was killed in an instant by that attack

"What the hell...!"

Cryselys who was now flying in the setting sky looked at the place she was seconds ago with clear confusion at what that magicless attack was. But her attention was brought to somewhere else when she felt an enormous amount of magic rapidly approaching her army... And it was coming from higher up in the sky, then a single line crossed the sky and crashed exactly where her army was creating a huge explosion that decimated half of her army

The explosion pushed away all the dust and smoke, allowing the surviving demons and Cryselys to see the cause of the explosion. There was a single individual in the middle of the crater created by the explosion, and that individual was the hero John Hero, he then looked up making his eyes meet with Cryselys eyes for a moment, then he began running in her direction with his right arm extended to the side, in just seconds he left the crater and began running even faster on the open plains