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One punch man:Traveling between worlds

This story is about a simple otaku who has above-normal physical powers and psychic powers who doesn't use these abilities for anything, except for basic things. This is our protagonist who lives in a time of peace. Being the son of two heroes, he doesn't have much to do other than read manga or watch anime since his parents are already stronger themselves, not letting their son have the opportunity to be a hero. But what would happen if this boy traveled to the worlds he reads about and sees every day? And that's what we're going to find out.

GrandMasterBRX · Anime & Comics
Not enough ratings
73 Chs

Warning! Don't make Saito angry!

Continuing where we left off 

****************

Franky: Hey! What's up Usopp?! - Sanji said complaining. 

Chopper: That's really cool!!! - Franky shouts happily. 

Saito: I don't even care anymore. - Nami responds depressed. 

Sanji: Thanks, Usopp! - Chopper thanks. 

Nami: I admit it's not a bad idea. Oh, how I miss being a man... - I say this in a sad tone. 

Franky: That's going to ruin Nami's beauty! - Sanji said this pointing at me. 

Usopp: Stop complaining! We'll get confused without this! - Usopp said. 

Usopp created small masks with each of our faces and put them on our foreheads, to help identify who is who. 

During this, Luffy and the others interrogated a centaur man who works for the owner of the island, he calls him "Master" and the children call him that too.

He reveals how the "worst generation" came about, how he lost the lower part of his body, and how he was saved by the "Master".

He said that in the past this island was a place where the Navy experimented on prisoners, but one of Dr. Vegapunk's inventions malfunctioned and destroyed a large part of the laboratory.

As a result, the Navy fled and left the prisoners to die. However, the "Master" saved them by giving them a way to survive on a devastated island. Hearing this, it seems that this "Master" is a good person, but I know that not everything is as it seems.

The last thing the guy revealed is that Law is working for this "master" and that he helps with the experiments.

Luffy: So Traw really is a nice guy! He also saved my life! - Luffy said this smiling and I held Yamato tightly.

Nami: He's so nice that I personally want to cut his head off! - I say this because I'm angry about what Law did to me.

Saito: This Vegapunk is really a terrible person. - Nami said.

Franky: That's why those half-sheep people were in the lab. - Sanji said.

Usopp: The centaurs and a bird woman, now it all makes sense. But wait... what about the dragon? - Usopp asked.

I didn't hear what the centaur said about Usopp's question, because I'm already fed up with hearing blah-blah coming from him, so I decided to take a nap.

***********

After sleeping for a few minutes, I open my eyes and see Franky becoming a toy for the children and Brook and Sanji walking towards me.

Brook: Saito-san, we need a little favor from you. - Brook said and I'm curious about what he wants.

Nami: Ok. What do you want? - I ask waking up.

Brook: Can you show us your panties? - He asks this question as if it were something normal. 

Franky: And let us take a picture too! Especially of the breasts! - Sanji asks being very excited. 

💭WHAT?! 

Saito: Wait a minute! You idiots!!! - Nami screams and beats the two idiots. 

After this "incident", Brook, Sanji and Zoro went out to look for Kin'emon who had disappeared, seeing that everything was calm I took a nap once again.

****************

Minutes later I wake up and hear one of the children screaming in agony, that woke me up right away.

💭What's going on now?

Luffy: Chopper, he said he can't breathe. Help him. - He said it so casually that it scares me how he can act like that, in a delicate situation.

At that moment other children are on the floor agonizing in pain and headaches.

Saito: What's going on?! - Nami said this worried about the children.

Chopper: They're falling! Especially the big ones! - Franky said.

💭 It was just me falling asleep that things are going bad....

Saito: Chopper, what was that? Are they really sick? - Nami asks the doctor.

Sanji: No. Synd, do you want anything now? What do you usually do at this time of day? - Chopper asks the child for his name.

Synd: What I usually do... We do a checkup and.... after that..... - Synd can't finish because the pain is increasing. 

Sanji: What happens after that? - Chopper asks. 

Synd: I get a candy.... - the boy manages to answer the question. 

Nami: Candy... this can't be a simple candy.... - I say this not liking what's happening at all. 

The children who are still well said that the candy is delicious and is very good for them, the candy gives off smoke when they eat it and that it makes them happy. Chopper tried to find answers from our prisoner, but without success. 

Saito: Chopper, did you find out anything?! - Nami said, becoming apprehensive. 

Sanji: NHC 10. I detected this in their bodies. Even though it's just a trace, this is.... a drug! - Chopper answers, being angry. 

I'm surprised to hear this, I had probably forgotten this information due to the time I watched One Piece. 

Sanji: Only selected doctors from some countries are allowed to use it! I know it because Doctrine was one of those people. Even when used for its true purpose, to cure diseases, it is used in small doses because it is highly addictive! These children received a small dose of it every day and became chronic addicts. They are eager for another dose to relieve the pain. Why is he doing this to these children?! So that they can't leave the laboratory?! What does his "Savior" want to do..... with these poor children?! - Chopper said this being outraged by what he discovered and I am silent listening to all this. 

💭 So.... is that why they are like this? They were drugged and probably suffered or will suffer another type of experiment....

...just like Eri suffered.....

Something inside me changed when those words entered my mind and I couldn't do anything, as if my body didn't want to obey me at the moment, that I remembered Eri's situation.

I heard that some children said that they arrived at the laboratory at normal size, but the "Master" messed with the children's hormones, making them grow more than normal, becoming giants, even though the giant race is already born big. 

The children began to lose control and attacked the group, fortunately Usopp acted quickly and threw a gas that made the children sleep. 

💭He took those children from their homes, stole their joy, made them guinea pigs and now they are drug addicts.... I imagine something like that happening to Eri... and imagining her in that situation.....

.... makes me FURIOUS....

Saito: Saito, are you okay? - I hear Nami's voice taking me out of my trance. 

Nami: Huh? Yes! I am. What happened? - I say this looking at everyone.

Sanji: You were quiet the whole time we were worried. - Chopper said.

Usopp: Besides, you had a face that was giving me the creeps! - Usopp said this trembling and I was surprised, but I immediately understood what was happening.

💭 I get it... I ended up letting my negative emotions out.

Nami: Ah! Sorry guys, it's just that hearing what Chopper said about the kids made me really angry, you know? Anyway! What are we going to do now? - I say this disguising my anger as much as I can.

💭 I need to let go! This annoyance won't go away if I stay still! I have to destroy something!!!

When I'm really bothered by something or really angry, one of the ways to calm down is to play games, watch anime and read manga, the problem is that this doesn't always help, so I prefer to go to an empty place to vent.

The problem is that I can't do this with Nami's body and even worse if it were in my own, in other words, I'm in a bad situation to get angry.

Luffy decided to go after the "Master's" laboratory and find Law to solve the problem of the exchange, the people who will accompany him are: Robin, Usopp and Franky, Nami won't go because she's scared (and I have to keep an eye on her) and Chopper has to watch the children.

With everything ready, the group left, leaving the three of us alone with the children and I'm holding Yamato very tightly to control myself.

Saito: Chopper, where's Zoro now? - Nami asks.

Sanji: He's with Brook and Sanji, so I don't think he got lost in the snow. - Said Chopper.

At that moment our hideout started to shake and we heard bangs outside, it sounded like an earthquake, but it wasn't. Chopper went to investigate, but he didn't see anything.

Nami asked Brownbeard (the prisoner) about what he knew, the pirate replied that they are skilled assassins who kill in the snow, they are practically Yetis and that the master sent them to save him, but that's not what happened.

One of the assassins entered our hideout and pointed the gun at Brownbeard, asking his name, since he's on the target list, the pirate got scared and the assassin confirmed with the master's voice telling him to kill him. With that, Brownbeard was killed at point blank range in front of us and I let it happen without caring about his death.

💭 One less dead weight....

Actually I'm happy that the assassins are here, now I have a perfect opportunity to get free without any problem.

💭Well, I want to kill their master, but two half-baked Yetis will have to do for now...

Rock: Hey, Scotch! Don't shoot like that. You don't want to hit the brats. - Said the Yeti outside. 

Scotch: Whoa! That's not soft at all. - He replies. 

Rock: Look over there! Their captain's back! - Said the Yeti looking outside. 

💭Hmmmm... so Luffy's coming back? That's not very good... I'll deal with that when the problem comes. 

At that moment I see a Yeti's hand approaching me.

Saito: Saito, be careful! - Nami screams worriedly and I just smile and pull Yamato out at the same time.

The Yeti's arm is cut into several pieces and the blood gets a little on my face and then the Yeti lets out a scream of pure pain.

Scotch: Rock!!!! - The Yeti screamed for what happened to his partner and he aims his gun at me, but I'm already in front of him.

Nami: Too slow... Itto Ryu!! Muyo Sandazuki!!!

I use my technique using King's Haki and pierce the Yeti's chest three times in a row, making a huge hole and blood spreads on the snow and on my face.

Rock: Scotch!!! Oh no! The Yeti without an arm quickly grabs his seriously injured companion and runs away.

Nami: Awwww don't run away from me~ I'm not done playing with you guys yet~ - I say this in a feminine tone and sounding like a Yandare. 

*******

Nami's view 

*******

I've heard stories of Midori no Akuma, during these last 2 years that have passed, I know what Saito did in Marineford was...

Scary....

Knowing that a person who traumatized many of the Marines and quickly became an Emperor is on our side, makes me very relieved. 

At first, I was afraid of him, but I soon realized that he's not that bad, he's handsome and nice sometimes, even though he can be an idiot and pervert at times...

Anyway, I started to respect him a lot, but after the Law situation, after knowing what this so-called "master" did to the children, Saito is very different from usual.

He barely says anything, he doesn't complain about the situation and he doesn't act like Luffy sometimes.

It was at that moment when those Yeti assassins came that they reminded me... Why the Navy calls him the Green Devil.

Saito: Saito... What... did you do... - I say this in total shock and fear at what I saw. I just witnessed Saito cut a Yeti's arm into several pieces and open a large hole in another's chest, making blood rain down on the snow outside.

Thank goodness the blood didn't get near the children. But even so, seeing Saito like that makes me scared.

I'm even more scared with him using my body and doing such an act.

Sanji: Saito... are you okay? - Chopper manages to ask this question after recovering a little and we both see Saito turning around with a face full of blood and a small smile on his face, seeing him using my body like that gives me goosebumps. 

Nami: Chopper, don't worry, I'm...fine...I just need...to be alone for a while.. - Saito answers and I know he's holding back so as not to say something bad, but I know what he's going to do and I think Chopper knows it too.

Sanji: S-Just be careful, okay? Try not to get lost. - Chopper said this trying not to look scared, but he can't and Saito just answers with a happy smile, as if what he did seconds ago was nothing.

Nami: I promise! I will return soon! - Saito said this running in the direction where the Yetis went. 

When Saito left we both let out a sigh of relief knowing that he was gone. 

Sanji: Even though I knew I was not in danger, I can't help but fear my death. - Chopper said this relieved. 

Saito: Hey, Chopper. Saito is going to kill them, isn't he? - I say this even though I already know the answer. 

Sanji: Yes, he is going to kill the assassins. Honestly I feel sorry for them. What Saito did was.... - He was going to finish, but I speak in the middle. 

Saito: Terrifying.... I didn't like that side of him, do you think there was a reason for that? - I ask this, I don't believe that that was the work of the same Saito that I know. 

Sanji: We will only know when Saito tells us in person. Anyway, this serves as a lesson for us. - Chopper said.

Sanji/Saito: We can't make Saito angry.

*********

3rd person view

********

The three murderous Yetis fled to a nearby cave and Rock tried his best to help his partner, but he died from lack of blood. Before he could mourn the death of a companion, he heard footsteps entering the cave.

Nami:I found you ~ - Saito said this with a smile on his face and holding the bloody Yamato in his hand.

Rock uses his remaining hand to shoot the woman, but Saito simply cuts the bullets using observation Haki.

Nami: Since I'm angry and urgently need something to calm down, you'll be perfect guinea pigs. Hehehe, it's ironic! You've experimented on several people and children, now you're at my mercy... Hehehehee this makes me laugh so much...- Saito said this laughing, making it echo in the cave and the remaining Yeti is in complete fear.

Nami: Well, I have to end this quickly, after all the others must be arriving, I'm not going to give you a quick death, but I guarantee you'll scream a lot! - He said this, approaching the Yeti with a blank expression.

Only screams of pain and agony came from outside the cave and Saito, leaves the cave with a smile of relief and a clean face.

Nami: Wow, how good this feeling of freedom is.... I really need this. - Saito said this, but he notices that he is not alone.

Law: So is this the fate of those who make the Demon Emperor angry? I admit that I underestimated you, Saito, you really are the nightmare of the Navy. - Law said, approaching Saito who quickly became serious.

Nami: What do you want, Law? You're lucky I just calmed down because if I didn't, you'd be dead. - Saito said and Law let out a light laugh.

Law: I'm aware of that, but I came here to make a request of you and Luffy too. - Law said.

Nami: Say it now! - Saito replied.

Law: I want the three of us to form an alliance. - Law said who only received silence from Saito. It was at that moment that Donflamingo acquired an enemy that he will never be able to control.

To be continued.....