Big Daddy Pirates 21 Amnesia

Yuuki could see a lot of pirates talking and walking happily in the street. He didn't see any Navy in this place. He could also see someone with an ancient Chinese style kind of clothes with Happo Navy words on their back. He was very clueless about how to get hold of the Chinjao family in this place. He wanted to learn Hasshoken but he didn't know whether they would let him or not. 

Yuuki wasn't a crew member of the Happo Navy and he didn't have a family relationship with Chinjao. He wanted to steal it but he wasn't sure he could escape from someone with a bounty of 500 million Belly. He could beat some small fry or his subordinates. But to beat the experienced pirate in the age of Gol D. Roger, he needed more than his devil fruit. 

Yuuki really wanted Hasshoken since the possibility of this martial arts was limitless in terms of power attack. 

Hasshoken ignored the defense of someone and attacked the organ directly. This martial art was also quite similar to Gura Gura no Mi but on a small scale. 

The Gura Gura no Mi is a Paramecia-type Devil Fruit which allows the user to create vibrations and Hasshoken allows the user to control the vibrations around their limbs to generate shock waves. 

Yuuki knew the only reason why Chinjao lost to Garp was the difference in physical abilities and Haki. If someone like Kaidou used this martial art then Garp wouldn't be alive now, though, Kaidou didn't need this kind of martial art to become stronger. 

Yuuki knew all kinds of techniques were useless in front of powerful physical abilities. His devil fruit granted him very powerful physical abilities but he wasn't satisfied and wanted to become more powerful. He trained every day and night, but he knew this wasn't enough. He wanted to become more powerful and that was why he came to this place. 

Hasshoken was both similar to 'Beat Punch' by Zebra and 'Hadika Hadeka' by Aladdin. 

Zebra, in order to increase the destructive power of his punch, channels sound vibrations through his fist. This increases the destructive power of the punch many folds and generates sound waves which echo repeatedly within the victim's body, causing massive internal damage. This technique is called Beat Punch.

Hadika Hadeka is a Composite Magic which combines Sound Magic and Wind Magic. It uses Aladdin's Wand to make the air vibrate extremely fast by using Sound Magic. It can pulverize the stone with one touch. 

Both techniques revolved around vibrations and both of them were very strong. 

That was why Yuuki needed to learn this martial art. But he didn't know how to get the attention of Chinjao family. He looked around and went to the gambling house since he couldn't think of anything at all. His devil fruit also increased his luck and he wanted to get the attention when he brought a lot of money. 

"Why are we going to the gambling house?" Perona asked. 

"Hmm, I am stumped, let's play maybe I can think of something," Yuuki said. 

"Do you think you can win?" Robin asked. 

"Heh, if you ask that question to someone else, they will be unsure, but if you ask me, I will empty this gambling house," Yuuki said. 

They looked at him with a doubtful expression but he decided to show them when the God of Gambling entered the world mortal what would happen to this mortal world. 

---

"...W-wow," Perona looked at the amount of gold he had gotten from gambling. 

Robin was also shocked at his gambling skills. 

Yuuki smiled he had put 1,000 Belly but his money had been increased by 10,000 times. He thought the best ability of his devil fruit wasn't his physical abilities, fire manipulation, electric manipulation, or his air walking but rather his luck. He remembered there was someone called Baccarat in the One Piece. She had eaten Raki Raki no Mi and she could take luck from anyone as long as she touched it. 

Yuuki didn't know how his luck power worked since he didn't practice it. He only used it on himself and luck itself was quite a complex concept. He couldn't see it and he didn't know how much luck he had on himself. He could see the progress of his other power but not his luck power. 

Yuuki stopped gambling because he felt bored. He decided to go out but as expected there were a lot of people who had greedy eyes on him. He was only a kid after all and they must have underestimated him. He also just got a lot of gold from the gambling house and he must have become their target. 

"Boy, why don't you give us, all of your gold?"

"Yeah, that is too much for you, why don't you share some with us?"

"Hahahaha, how do we sell him? There must be a lot of people who want to buy him!" 

"Look, the 2 cute girls beside him! Let's sell them also!" 

Yuuki felt tired when he had to fight this small fry. He should have brought his subordinates along so he didn't have this kind of problem on his way. He made electricity on his hand but suddenly he heard someone scream. 

"YOUNG MASTER!!!!" 

"KILL!! SOMEONE DARE TO THREATEN YOUNG MASTER!! KILL THEM!!!" 

Suddenly a lot of people with ancient Chinese clothes came. All of them raised their blades toward the people who had threatened him. 

"BUTO!!!" 

When the pirates were in a confused situation there was someone with a huge body who jumped toward them and headbutt the ground. 

BAMMM!!

The headbutt destroyed the ground and shook the area. 

Yuuki needed to hold both Perona and Robin so they wouldn't fall from the shook. He looked at the giant bald elderly who came with crying face to him. 

"YOUNG MASTER, YOU ALIVE!!!" 

Yuuki twitched his lips and said, "Who are you?" 

At that moment, the time stopped and everyone was shocked.