It is my first moment going to sleep in this world, I suppose I do live in refuge of Garp, the grandfather of Luffy, so I was expecting to go to sleep pretty soon. However, there is something odd, it's the feeling of going to sleep. Whenever I close my eyes it feels as if I'm being dragged away, when I open them I have not moved at all. It is a convoluted and annoying feeling.

I closed my eyes once and for all, when the feeling was present I did not dare to open my eyes to see if what I was thinking was true, it was just a feeling. Unexpectedly, however, I found myself say in front of a mirror, although I'm not too certain of that since my eyes seem to have a blue tint to them for some reason, and the image isn't copying my blinking patterns. Wherever I was, it was odd, the blue tint was the only colour and there was only me and another miniature Luffy in front of me.

"What are you? My reflection?" What on Earth is wrong with this person? He thinks I'm a reflection when he is making a confused expression and I'm not mimicking it?

"No... and I take it that you're Monkey D. Luffy?" The kid clearly went back in shock, his face literally screamed from the shock that he was talking to someone that looked like him yet wasn't a reflection. "I'll take that as a yes."

"Huh? How do you know me? Are you some kind of friend of Jii-san?" Well, at least he's not a complete idiot, he recognised that I knew him yet he doesn't know me. Or he is just still an idiot and is just asking the question for no reason. Now that I think about it, I wasn't expecting to meet Luffy at all, I thought I had become him. It appears that both of us inhabit the same body, if that's the case then why am I the one who is in control? I suppose I should try to explain that later, this child needs some form of explanation.

"Think of me as your..." I have no idea for such a thing, this unprecedented event has completely caught me off guard I need some way for him to identify me without any issues. "Twin brother? Sure, that works fine, twin brother."

"I have a twin brother? Oh, that's pretty cool, so whose the oldest?" Whose the oldest? Is that really this child's priority at this point? I was expecting someone dense but not a complete dumb-ass. Technically, I should be the oldest at this point, since he is a child who is about seven and I know I used to be an adult who was older than 20.

"Me, so-" I was going to speak, but the guy cut me off!

"What's your name? Is it Luffy as well?" Damn it, I guess I should get a new name since Luffy would be confusing him at this point. Let's see... considering the direction I want to go in I suppose the better name is just a nickname.

"Mugiwara(Straw hat)." I sighed, he had an excited expression, but I just chose to continue my words. "Luffy, do you have an idea where we are?"

"Dunno." His answer was blunt and quick, I suppose I shouldn't really expect much from him in terms of thought, so I have to figure it out myself.

The tint, that's got to be a hint since that's the only colour in this place. Luffy is also present when I thought he was gone completely, if both Luffy and me inhabit the same body then that means we are in the same place. Then, if that's the case... is this place a construct of Haki? The blue tint, even if it was just an editing effect in the anime, it's still possible that it represents Haki. Then... how was this created? I know that it requires an absurd amount of Haki for Luffy to use Gear Fourth, which is completely enhancing his muscular strength, however this is creating some form of willpower world, how much does that require?

Well, if that's the case then it's possible to speed up a lot of things by doing this.

"Luffy, you want to be a great pirate, right? You want to prove to Shanks-no to the world that you're not just some immature kid. You want to prove you can rise up and become a great pirate, right?" I queried him, I also took a guess at what his answer would be as well.

"OF COURSE!" He was certainly enthusiastic, I was slightly caught off by his volume.

"Then, this place, let's call it our domain. Here you can practice all you want, you can train and fight to become the greatest of pirates! Of course, I'll also be participating, but in a different manner." I explained to him, he nodded with a definite thirst to become stronger. I somewhat was pleased by the response. "I'll be training off on my own, Luffy I trust that you'll be able to train yourself to become stronger. You have it in you."

"Wow! You're a really cool twin brother!" I somewhat feel that no matter what, he would always just say something like that, even if I asked him to call me a duck or something.

Luffy was focused already, he seemed to understand the meaning of what I had said. He was practicing hard to create techniques, in fact he was  creating the famous 'Gomu Gomu no Pistol' at this very moment.

While Luffy was to focus on physical attacks and genuine training in the body, I decided to focus on things a bit more to do with the mentality and willpower. If my guess is correct, then nothing is shared between me and Luffy. All the concepts of his moves, I am aware of, even the majority or even all of his moves. Luffy lacks that knowledge at this point and needs to develop it, he needs some fundamentals of a style first.

For me, I shall specialise in Haki. Luffy's specialism is most definitely physical, however if I am correct about one thing, then I'm sure I am... naturally stronger in Haki. In other words, my willpower surpasses Luffy's, how or why, I'm not sure or even sure that it is. It would explain a lot, for starters why I'm in control and Luffy isn't. I'm easily suppressing him with willpower. Also, the Kenbunshoku Haki, I used it without much training and it only took a few minutes with a blindfold. That's actually quite an achievement. I just need to learn to exercise it more and make it stronger.

Did you know this story is from Royal Road? Read the official version for free and support the author.

For starters, only two Haki's can be used simultaneously, therefore I can train two simultaneously, so if I close my eyes and focus on the presence and strength of... Luffy, then I'll become accustomed to it. I've also got to practice using Busoshoku Haki, it's also essential if I want to survive.

It is literally wearing the spirit as an armour. I have to do such a thing while also focusing on Kenbunshoku, this will definitely take some time.

Oddly enough, that wasn't the case. I felt it, as if it my spirit was wrapping around my very arm, easily and even hardening! That was far too easy, something clearly isn't right here.

"Hey, Mugiwara! I did it! I got my first technique, want to see it? I'll show it to you!" Wait, did Luffy just say he got the first technique down? Pistol? It took him a few years to master it properly, something clearly isn't right here. It has to be with where I am!

Seeing this place, it's pure Haki, but for certain I'm sure that it's not the Haki of both of us, if that was the case... I would feel parts of this place specifically since it is Luffy's presence and strength. I can't feel any and I can use Kenbunshoku Haki smoothly, very smoothly! Is this place just using my Haki? If that's the case, then is this working as a sort of enhancement in terms of training?

I can feel the flow of Haki more easily, I can even use Busoshoku Haki without any prior experience or training. It is without a doubt that I have some strong form of willpower, perhaps too strong. If that's the case then there's a possibility this is linked to my prior life. Even if I was a loner I had a job, hobbies and other past-times. Okay, my only past-times were gaming, watching anime and reading manga, so it can't be one of those. So, my job is possibly linked to my willpower. Then what could it possibly be?

"Gomu gomu no..." Luffy was already preparing the attack, his arm stretched far behind him, it worked flawlessly. It came forward, increasing in its speed. "PISTOL!"

I would say it hit me, I was amazed and then I praised him for his skill. No. I was able to dodge it easily, I've seen it thousands of times and this wouldn't have any effect on me even without Haki. Actually, this could benefit both of us...

"Luffy, try to hit me using only that technique." I commanded him, he looked at me with an angry expression, I think I might of pissed him off.

"Don't tell me what to do, Mugiwara!" It sounds pretty awkward to hear him say that, but he continued to relentlessly use the technique on me. Of course, while he attempted to do that I used Kenbunshuko Haki to dodge it, that was to increase my familiarity with it. I also practiced use Busoshoku Haki as well, I used it on my feet, head, arms, chest, back, everywhere! It seems that while we're here everything has no limit. I can use Haki forever, I can run forever, I can jump forever, even Luffy can. "Mugiwara, you look funny."

Luffy finally took notice, it seems that I can't use Busoshoku Haki without hardening, from something like that then it simply means that my Haki is too dense, or in other words it's too strong for there to be a point where it's just invisible armour. That's actually quite problematic. I have so much willpower yet I don't know where it's from.

"Luffy, continue with what you were doing." I need to work on using the Haki's efficiently. This is most likely just the effect of the domain, so I need to be able to train all of this to the point where it's no longer an issue in actual life.

"NO! I WILL BEAT YOU, MUGIWARA!" Damn it, I should've expected this when I told him to attack him. Luffy isn't the kind of guy to just give in to orders. He still attempted to hit me, but I did still dodge. He tried harder and harder... oh my, isn't this Gomu Gomu no Gattling?

"Huh, not bad. Although, you should evaluate the technique by yourself." I tried to reason with him, I thought it was a good idea at first.

"NO! I WILL BEAT YOU!" Damn it, he's not giving it up. This is actually getting on my nerves at this point. I have to evaluate a lot of ways to use techniques and even create new ones, since at this point I won't have the physical experience that Luffy has, I am currently physically inferior in terms of physical skills. I know a lot of his techniques, but I haven't performed them at all.

"JUST SHUT UP!" I grabbed his hand while it flew at me, staring down at him, I didn't want to get angry just because he wouldn't stop... but I think I accidentally did something worse. Luffy looked as if he was complained about how I grabbed his arm, but he just foamed around the mouth and fell down on the ground. "Luffy, are you alright...?"

I did what I think I did, right? I totally just used Haoshoku Haki accidentally. You've got to be kidding me! Well, I guess this sorted out my problem, but in the most unorthodox way there is. I should wake him up. I tapped his forehead, while it did nothing for a few minutes it did eventually wake him up!

"Huh? What happened? Is it breakfast?" Well, he's a very meal-centred person. I suppose that's slightly a good thing, right?

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A/N:

Don't worry, there's a reason for the MC's ungodly strong willpower. XD