Boruto and Yataro went to the grand canyon

"Okay, I think this place will be good for training. Boruto, unleash that demonic crystal energy you've absorbed."

Boruto nodded doing what he said, when he released the power of Zexiro's crystal, a powerful shock arose, Boruto's body was surrounded by a dark purple aura, the pupils disappeared and black rims appeared around his eyes, additionally the hair began to rise.

"You must gain control of this power, this will be the first step in defeating Momoshiki's soul." the demon said

-GHRAAAAAAAAH!

Boruto attacked Yataro chaotically, the demon tried to block his blows, but in this state, Boruto's power was more powerful than he thought. At one point he got a punch in the face and flew a few meters back hitting it upwards making a dent in it.

"It seems that I have to fight seriously," he thought, unleashing his demonic power

Half of Yataro's body began to cover a dark demonic shell. Yataro attacked his student and began to exchange blows between them, the fight was very even.

"I won't get anything back, I'll have to stun him to get him back to normal."

The demon was forced to break his thoughts to avoid Boruto's attack. Yataro put his hand to the genin's stomach, then released a beam of energy, throwing him back a long distance, then appeared behind Boruto and with a blow to the neck knocked him out, the purple aura surrounding his body dissipated and his appearance returned to normal.

"Ehh, we still have a lot of work to do."

Yataro picked up Boruto and went to another place, some time later a man came out of hiding with black hair with a blonde fringe falling over his forehead.

"Yo Yataro, we haven't seen each other for a long time."

"Azazel, what are you looking for here?"

"Why so unpleasant? I was around when I suddenly sensed two sources of demonic energy, recognized that one of them belongs to you, but the other ... let me guess belongs to that boy?"

"It's a long story, so let me just say a shortened version. This boy, thanks to his ability, managed to absorb the power of the Zexiro crystal, but he cannot control this power."

"I understand, so that's why you decided to take him as your student."

"Not only, you see when I fought with him, I saw potential in him, in the future he will undoubtedly become a strong warrior, and if he still manages to master the powers he has, it is guaranteed that he will become one of the most powerful beings that have walked on this dimension, be perhaps he will surpass the demon lord himself."

" Interesting"

Meanwhile, Gakuro, Ira and Hiruko were in an unknown place, Kawaki was locked in a chamber.

"It seems like Yataro cheated on us and is training Boruto." Gakuro announced

"What, but why would he betray us?" Ira asked

"I have no idea, but for some time I guessed that he might be up to something. Ira, Hiruko, get rid of him and Boruto, and when you do, bring back the crystal."

-Hai Gakuro-sama