Maou-sama no Machizukuri! ~Saikyou no Danjon wa Kindai Toshi~ - Volume 7 Chapter 10

An immortal cultivator is murdered by her master and finds herself reborn in the strange world of One Piece. She hardens her resolve to once more tread the path of cultivation, only to find it won't be as easy as she thought.

Legend says, that there is a great demon, who is the human kind’s public enemy. He is the galaxy federations’ nightmare as he wanted to conquer the whole universe. On the first day, he completely took out the human fleet, plunging them into disorder. On the second day, he declared that he will wipe out the whole federation. On the third day, he declared——that the hero who shot him in their previous battle must marry him, or else, he will destroy everything.

The galaxy federation president and the council members had a long meeting after that. They decided to dispatch a soldier, Wu Xing Yun, and marries him off to the arrogant demon. Wu Xing Yun was once a hero who fought for the nebula, and henceforth, he was tasked—— for the sake human race and the universe’s peace, to eliminate mistresses, settle his matters with the mother-in-law, and fix the man’s crooked ways.

Wu Xing Yun was very perplexed when he asked his commanding officer: “Sir, why did it have to be this way?”

Commanding Officer: “Soldier, bear in mind, that this mission of yours, is for the sake of the universe and mankind’s happiness. You must hold on to your husband, and fight other mistresses! Do you have the confidence to accomplish this task?”

Wu Xing Yun, stood straight, saluted, and instinctively replied: “Sir, yes sir! I will accomplish this task!”

- Description from Novelupdates

The person who was locked away inside the thorn-covered tower was not a princess, but a witch who employed the powers of darkness.

A brave young hero came searching for the tower in order to kill the witch.

– Light would force the darkness to recede, and grant it eternal rest

The witch wished.

That things would end with, ‘and the hero lived happily ever after killing the witch,’ like in the fairy tales.

And so, she had devised everything to happen in accordance to her wishes.

But the boy, who had grown up in but no time at all, would make the unfamiliar face of man’s from time to time.

“You want me to kill you? ……Do you really think I’ll let you go?”

Reality was very different from the fairy tales.

“The people don’t know of the precious treasure locked away in the tower.

I won’t let anyone else have this god given treasure, this crown of god surrounded by thorns that no one else could recognize.”

The hero gave the witch a slow and deep kiss.

“I am the true victor, and no one else.”

When I was 15-years-old, during the year that I graduated from middle school, my father told me this.