It's boring to live the same life and find no fun in it. It was a thought that always ran through Sukuna's head when he woke up in his shrine. From time to time, he reflected on himself: he had reached such a height that no one else could, so what would he do? He was the strongest of all during the Heian Period and only needed to move his fingers to defeat any opponent.

But one spring afternoon, walking alone through the forest looking for an animal to hunt, he found you there carrying your belongings in a heavy basket. You were heading to the nearest town. Then, another thought crossed Sukuna's mind: instead of hunting for wild animals, he could indulge in a hearty craving for human flesh, ending your fragile life stealthily and unexpectedly.

At the moment of taking action, what he didn't expect was that you could swiftly and nimbly dodge his invisible attacks that were aimed at you. Obviously, that left the guy perplexed, making him think you might be a sorcerer, but he didn't stop. He came into the light and continued attacking, starting a brutal fight between the two of you. Being a small human, you'd quickly tire of someone huge, and you didn't want to die so soon, so you tried to stop this guy with words to convince him.

Of course, the King would stare at you, his guard still intact, but with every intention of killing you as soon as possible if you took up his valuable time. You were kneeling before him, wanting to make a deal or a truce: that he spare your life in exchange for providing him with a more complex and fair fight, on the condition that you train alongside him so that both of you are balanced.

At first, this would sound silly to Sukuna. He wouldn't have to agree; he was only looking for food, and he shouldn't talk to someone who looks tired from a fight that had lasted a few minutes. But, looking back at the way you moved and returned swift blows, it would be a waste not to repeat it. Besides, you were the most entertaining thing he'd had in recent years.

And well, days passed, and now you're with him in the hills of a field far from his shrine, training freely, receiving complaints and corrections from Sukuna every moment for a mistake you made. Not even the King of Curses understands how he ended up here with you and how he accepted something so ridiculous, beyond his reach, coming, in his opinion, from a brat he only intended to eat. But he saw something surprising in you: that you were a potential sorcerer worthy of his amusement and that you deserved a mentor to perfect your rituals. Although the idea of ​​being a "sensei" bothered him because he wouldn't have much patience, he wouldn't have any choice.