Back story,
Sasaki was standing in front of an abandoned building that their seven buddies referred to as a secret hideout and welcomed him to their usual gathering.
Sasaki was eager to relive his experiences with his seven friends, as he had lost his memory after attempting suicide.
"Everyone must have arrived by now. I should get going."
Sasaki entered the building. The facility was filthy, with rubbish strewn about and metal scraps scattered on the ground.
"The inside, like the outside, is quite darkish."
As soon as he saw him, one of his red-haired friends called him out.
"Hey, Haise, in here. Not over there."
"Ohh! Keiko, you've already arrived. Where have the others gone?"
"They are expecting you. What was it that took you so long?"
"Hehe, family issues? Don't be concerned."
Keiko was becoming restless. He was losing control of his eagerness.
Sasaki entered the room without hesitation, and as soon as he did, he was struck on the back of his head with a metal pipe.
*Baam*
*Ting*
Sasaki was knocked out in an instant.
He awoke after half an hour when his body began to hurt. He noticed that he was tethered to a target board and that his seven companions were staring at him.
"What are you doing? To put it another way"
"Hahaha, Haise, you seem to have forgotten all the time we spent with you." This will help you remember." A man with blue hair talked with a broad grin on his face.
"How would this help, and what are you trying to accomplish? I'm getting frightened."
The blue-haired guy shoved five pills into Sasaki's mouth and forced him to swallow them all at once.
"Wait, what was that just now? You're all behaving strangely. Please let me go home."
The blue-haired youngster carefully pinched him, but the pain was worse than being stabbed.
"Aah, Aah." Why is this so painful? What did you do, Kaito?"
Sasaki's eyes were welling up with tears. The tears would not stop falling from his eyes. He was totally helpless.
He was kicked in the crotch, which was a whole other level of pain.
It stings! If you hit me there, I'll die. Aah! Save me, he's going to kill me."
Because of the medicines, his pain was ten times worse, exacerbating his suffering.
A blonde female approached him and softly stroked his head.
"You'll save me right away, Miyu!"
Miyu immediately grabbed his hair and began whirling his head round and round with just his hair.
The remaining four joined in and began abusing him. They went to the market and bought a variety of items specifically for this occasion.
He was tortured by each of them, one by one, hour after hour. He couldn't think because he couldn't understand why they were treating him this way.
"He is so frail that he can't even withstand such light pain." While Sasaki's mouth was tied with rope, the red-haired boy shouted up, taunting him.
"He's pitiful, he is. Instead of losing his memories, he should have just died."
Instead of losing his memories, he should have just died."
'Why? You are my friends, then why are you doing this?'
He was sobbing and screaming, with his mouth tied yo. They could hear his screams.
"What a shame. We will torture you to the point where you will gladly commit suicide, and if we see you at school again, we will not stop and kill you from the intense suffering ourselves."
'They want to kill me, but I have done nothing wrong.'
They abused him nonstop for an entire day. He begged for his life over and over, yelled and wailed, but it was all in vain.
They continued to inject medications into him to keep him awake and gave him more pain enhancers.
During the tortures, he regained his memories. He recalled the painful days he had endured as a result of their bullying and his suicide attempt.
After recalling all of his memories, he fell silent. He had been tortured too much for him to think clearly, and various thoughts began to enter his mind.
'I should rather die than live this way. Yes, that would be a good thing.'
After hearing his screams, he glared at the seven laughings, and anger, hatred, and other such emotions invaded his mind.
'Why should I die? I'm going to kill them all if I am going to die then l will take them down with me.'
'Each and every one of them.'
"Each one of you, all seven of you!"
All seven of them observed that Sasaki had stopped yelling and began speaking to them in a hostile tone.
"Is our toy insane? We will teach you a proper behavior."
*Baam*
* Slam*
*Punch*
*Ting*
Sasaki was brutally attacked again, this time with an overdose of narcotics.
"Why won't you scream?" Just die.
*Baam*
*Baam*
Saski didn't scream a little after that, no matter what they did.
He gave up on him after another hour of beating him because he didn't scream and he stopped having fun.
"Untie him, and you will die by tomorrow, or you will suffer a fate worse than death."
Sasaki smirked gently, but they didn't notice.
They left Sasaki to recover, and they returned home, Sasaki tried moving his body with all of his strength.
'I may collapse at any time; I need to get home.'
He couldn't, so he slept in an abandoned building's unoccupied room.
Now on Fisherman's Island
"That day, I told myself that I would kill them all, all seven of them."
"I will take extra time for you three, Keiko, Kaito, and Miyu."
Sasaki took a little break after cleaning up the corpses.
He was simply relaxing when a group of fishermen surrounded him. They were fiercely glaring at Sasaki.
Did you kill all of our comrades? Say something!"
Sasaki pretended he didn't understand what he was saying.
"What exactly are you talking about? I'm at a loss for words."
He grabbed Sasaki's collar again, this time angrily.
"The blood is visible on your clothes and body. Don't even try to conceal it."
After the fight with them, Sasaki failed to dress up properly, and his body was in bloody crimson.
'I made an error, and things aren't looking well for me.'
"It was those people. They utilized deception to murder all of our fellow fishermen. I was in mourning since one of them was my father."
Sasaki burst into tears by poking his eyes and concealing his face.
Sasaki's eyes began to well up with tears after that.
"Aren't you a human? You have the appearance of one."
"I appear like a human, which I despise, but I am a Fishman like all of you, and I adore my Fishman pals."
He didn't trust him at all, but his cries appeared sincere, so he decided to take him back to the boss.
"Join us. We shall replace humans with Fishman, and you will be able to avenge your father."
With a resolute expression, Sasaki accepted it.
"I shall slay all humanity and swear allegiance to our leader."
'I'll fry you all damn fishes, but I don't want to end up in a locker for now.'
"Our commander, Hody Jones, would be happy to have someone like you on his side, young guy."
'The villain that Luffy thrashed in the Fishman arc, high-level cannon fodder. He had already begun.'
Sasaki was trailing them with a group of a dozen fisherman. He didn't act smart this time and simply followed them.
"He was the lone survivor, and as he said, those filthy humans employed cheap means to exterminate our species." There, his father was murdered."
Hody Jones examined Sasaki, who resembled a human.
"Is he, like us, a fisherman? He doesn't appear to be that way."
"We did a test in which he was submerged for ten minutes. He, too, is a Fishman."
Hody Jones didn't question him anymore, because his hatred was limited to humans and trusted fishmen.
"He could be a fantastic spy if you trained him to be flawless."
"Yes, commander. We'll teach him how to spy and fight."
Sasaki was now an official member of the Fisherman Pirates. He didn't want to deal with them, but it was unavoidable.
'They only care about numbers; in the future, they will gather a hundred thousand fishermen.'
'I might as well replace Hody Jones; they'd be a good bait to weaken those monsters in human skin before a future fight.'
"What makes you happy, kid? You're getting overly eager."
'I still can't hide my feelings. In any case, it doesn't really matter.'
"I want to be able to slaughter those dirty humans."
The fisherman who asked was pleased with his response. They desired a fisherman with such a mindset.
"We shall be allocated to the division for newcomers such as yourself. You can learn a lot there."
Sasaki was assigned to the division for newcomers. The section was in charge of light labor such as obtaining food for higher-ups and others.
'In any case, it's better than nothing. I'll take advantage of any opportunity to get into fights.'