Chapter 28: 27. Yin Seal and Upgrade
They have depart from Alabasta and got a new crew member. So now they move toward where the log pose pointed. The crew did their own business and Jon as always, train on the ship.
He didn't train since Katorea as he focused on learning about this world. But that also train his learning ability. He realized that he has underestimated Sharingan ability before and limitting himself. He keep thinking like a normal earthling because that was him for 22 years, a normal earthling and not a Shinobi, not to mention an Uchiha. So he decide to train and find his limit now, not using his mind to limit himself but find his real body limit.
From his experience in library, he had wasted a lot of sharingan potential. He just use it to see enemy movement or copying it. But it's real potential is actually a very high. It can make the brain processed what he see faster, so he can saw fast movement or copy them. It can see chakra pathway, even tough it's not detailed and can't see tenketsu like byakugan. It can see things like a microscop and X-ray as he remember Sasuke can see a very small explosive bug from Deidara.
He forgot about them and he also think that the sharingan didn't need to be trained. But now he realize that it's also a technique that need to be mastered. So for now he will train to activate his sharingan longer and lower the chakra usage when controlling it. He just realize that maybe his high chakra usage when activating sharingan is because he buy it and didn't activate it himself. So he will train and master them first before activating Mangekyou.
He realize that using sharingan burdened his chakra path that connecting his eyes with his brain. The higher level of sharingan will give more burden and damage. He guessed that when he activate Mangekyou Sharingan, the burden and damage will be a lot higher. He assume this is why Mangekyou user will lose their eyesight overtime.
The solution is like Obito, having Hashirama cell to heal the damage. Or activate Eternal Mangekyou Sharingan using someone else Mangekyou. Having EMS make the eyes stronger and the chakra pathway stronger too as EMS user is like having 2 MS at once. It's like having 4 eyes so the burden will lessened while the eyesight will be better.
So now he will train his sharingan, rasengan, mastering his new jutsu that he buy in Katorea, and his earth chakra control as he brought some soil and rocks in boxes to train on ship. The crew just stay like usual seeing a lot of Jon's clones, but Robin seem surprised. She hadn't saw him using clones as she's in castle when he fight the Millions and Billions. But she just let it go, as there's a lot of mysterious ability everywhere.
Jon will train some new jutsu after mastering the three he buy before. He make clones and start training. He and his clones always activate their sharingan while training to train it. When he train the three jutsu, no, two jutsu as the swamp is impossible to train on ship. He became surprised that the jutsu become easier and bigger.
"Combat and pressure is really the best condition to grow huh? I just train for one night before so the chakra usage is really high to make it that big in war, but now it's a lot lower. It's like i have train for a week, then i will master it faster now and can learn new technique."-Jon
Suddenly he remember something important.
"Oh no, i forgot my Yin Release reward, damn i forgot to ask Vivi too about the place of seal. Guess i'll stop training now, system said that it need a lot of chakra at first activation, and it can almost depleted my full reserve. So i will restore my chakra first and ask Vivi about it. I will activate it at night so i will recover tomorrow."-Jon
Jon go to the crow nest so he can call Vivi without anyone hearing. He still want to hide this from the crew for now and will tell them in the future.
*puru puru puru*
*kacha*
"What's up Jet? Why're calling me so fast? You missed me already?"-Vivi
"Of course i missed you, hahaha. But that's not it, i want to ask something. I got a new technique and it will have a small blue diamond mark. Usually it's placed in the middle of forehead, but i can change the place. Where do you thing is the best place?"-Jon
"Hmmmm, is it only a diamond mark?"-Vivi
"Well, when activated, a black mark like root will come out from each side of the diamond, and it's a cool effect actually."-Jon
"Then you must have it on the middle. You want to show it off when it activated right?"-Vivi
"T-that's not true, i just say that it's cool."-Jon
"Hihihi, i already know about your show-off tendency so don't worry. That's why if you want to show-off the forehead is the best place, you don't need to change it."-Vivi
"O-okay"-Jon
He got flustered that Vivi found out his hobby, but he relief she didn't mad or dislike him because of it. They talk some more before ending it. It's evening now and they will have dinner soon. After dinner, Jon decide to check the system update first.
[Upgrade succeed!
New features:
1. Inventory upgraded to 5000m3
2. Fuinjutsu available in shop now
3. Hidden Missions unlocked
4. Recalculation of World power ranks
5. 5x information storing and calculating ability
6. Basic Appraisal]
'Hmm, i understand inventory, fuinjutsu, and information storing and calculation. But i need to check power ranks and appraisal. Then Power ranks first.'-Jon
[Power calculation:
Using rank to calculate strength rather than number. The calculation will change into number after host find out doriki power. The previous calculation is not accurate and this in more accurate.]
'So it use rank, not number, it suit better as shinobi use ranks, but i need to find out about doriki soon to make the most accurate calculation. Show me the ranks!'-Jon
[Rank:
G: Normal Adult
F: Genin/Blues Marines Soldiers
E: Chunin/Marine HQ Soldiers
D: Special Jonin/HQ Lieutenant
C: Jonin/HQ Captain
B: Elite Jonin/HQ Commodore
A: Low-Kage/HQ Rear Admiral
S: Mid-Kage/Vice Admiral
SS: High-Kage/Yonkou Commander
SSS: Super Kage/Admiral
X: Perfect Sage/Yonkou/Fleet Admiral
XX: Perfect Jinchuriki/Pirate King
XXX: Six Path Sage/Unknown
Note: Bounty wasn't used as it was a threat level to WG and not determines by power at most case. Ranks are divided to (+), normal, and (-)]
'Hmm, it's almost the same and no number, isn't it a downgrade? But there's more rank there, hmm. But i know the rank didn't represent their position at all. Like Garp, even tough he is a Vice Admiral, but his power is almost the same as Fleet Admiral and even the Pirate King as they fought a lot of times.
Super Kage is the first generation Kages i think. Perfect Sage is maybe Naruto, or Hashirama with Sage Mode. Perfect Jinchuriki is maybe Naruto after he got Kurama's friendship. The Six Path Sage is... hmm, i don't know if it's Pain, Obito, Madara, or even Hagoromo.System which one is it?'-Jon
[Six Path Sage rank have a very big range, it's from Obito until Hagoromo. Even Naruto and Sasuke is Six Path Sage after meeting Hagoromo. Pain didn't count as he didn't have Juubi and his Rinnegan is Madara's, so he's weaker than a Perfect Jinchuriki.]
'Hmm, so Pain is maybe about the level of Super Kage or Perfect Sage. System, why use alphabet?'-"Jon
[Along with appraisal upgrade, the best calculation to be used is this as basic appraisal can't calculate power in number. So host will not get inaccurate reading if using numbers.]
'So lazy, sigh. But it's better now, at least i can check my enemy's power before a fight. Now i will check the appraisal. System appraise Zoro!'-Jon
Jon ask system to appraise Zoro that sleeping at the side.
[Roronoa Zoro: C+]
'.....WTF, Why's it only show C+? Where's the details? Fucking rip-off'-Jon frustated
[To show enemy's details, system need intermediate appraisal at System 3.0]
'Shit, so i still have to upgrade again and i don't know when i'll get it. Forget it, a least i know enemy's general strength. System, appraise me!'-Jon
[Van D Jono: C+
Str: C
Agi: C+
Vit: C-
Sense: C-
Int: C+
Chakra: B-]
'So it shows more detail when appraise me, and i am actually about the same strength as Zoro. Maybe my usage of power isn't as good as him. He has train since childhood afterall, but i need to catch up or i will be a burden to the crew.'-Jon
After checking the other new features, he decide to sleep as it's night already. But of course he will activated the Yin Seal first. He open the system storage and activated the Yin Seal. He decide to place it in his forehead like what Vivi said. He didn't feel anything at first, but sometime later he feel his chakra being absorbed by the seal, and it became faster and faster. Then before he know it, he faint. Luckily he's already in sleeping position so he doesn't fall. Jon wake up the next morning and curse the system.
'Damn, didn't it says that it would not depleted my chakra and just almost? So why it depleted completely?'-Jon
[Host still have a little chakra reserve, if it depleted completely, host will die]
'Eh? But, ah, ok.'-Jon
He take a small mirror and look at his forehead. There's a blue diamond mark there and he's surprised when he check the system about it. The Yin Seal is only filled by chakra at 30%. It still has 70% before it full, so it's about 2 time chakra depletion again. Furthermore, it can be upgraded in the future. The current limit is because his body can't hold more chakra than the seal limit now. But he can fill it slowly so no need to rush.
He decide to continue his training now that he has activate the Yin Seal. Like usual he make 10 shadow clones and divide them to train Great Fire Annihilation, Water Bullet, Rasengan, Earth transformation, and of course he buy Fuinjutsu. He want it since he became ninja but the system didn't provide it. So now he will learn it when it's sold by system. He want to learn Flying Thunder God and know that Fuinjutsu is a pre-requisite as he need to make his own seal to mark the location of teleportation.
When his clones train, the main body come to the dining room and eat, make the clone grumble as he didn't eat before make clones. Jon didn't care about their grumbling and just left, he can just dispell them afterall. Like usual their breakfast is heavenly as Sanji's cooking is so good, he also learn new recipe in Alabasta. After breakfast he dispell the clones and make the new ones as he's annoyed by their grumbling.
When the clones train, he remember something, so he call the crew.
"What is it Jon?"-Luffy
"Guys, do you want to be stronger and train even on the ship like me without breaking it and you can even do it while sitting?"-Jon
The crew of course became interested and nod their head.
"Ok, so i don't know if this will work but we need to try it. You guys know that i use chakra for my jutsus right? We will check if you guys can train your chakra, it's basically a form of energy, so it will make you stronger even if it's a little."-Jon
"Can we become ninja too?"-Chopper
Luffy, Usopp and Chopper have stars in their eyes. Even the other became interested by this.
"I don't know, that's why we need to find out. I never try this on other people. But first let me see your chakra pathway, every people have chakra, they just can't use it freely."-Jon
Jon activated his sharingan and look at the crew. He saw their chakra pathway and their chakra colors are different from him. His chakra is blue like what normal ninja in Naruto world. But their chakra are green, and the devil fruit users are red. The green chakra have normal chakra pool in abdomen, but the red ones are located in their hearts.
"Hmm, you guys have chakra but it's different from mine. Zoro, Sanji, Nami and Usopp have green chakra and have pool in abdomen like me. While Luffy, Chopper and Robin have red chakra and have pool in heart. I think it's because of devil fruit power, but i think the training is the same, just some change for the devil fruit users."-Jon
The other understand that they need to experiment first to find out if they can train their chakra.
"We will experiment first, and i don't know if it will work, and what's the side effect if it failed. So what do you want to do?"-Jon
They pondered for a bit, they have fought in Alabasta and they're still weak. Their opponent will be stronger and stronger so they need to be stronger too. They want to do Jon's training but they're also afraid of side effect. But finally they made their decission, The first ones that agree are Luffy, Zoro, Sanji and surprisingly Robin, then the rest also follow them and agree too.
"Alright then, let's get started"-Jon
CREATORS' THOUGHTS 
PeekACoo
PeekACoo The ranks just there to make it easier for me and you when assessing MC progress. It's not really a comparisson of Naruto and One Piece power ranks. It's only to make MC have the reason to reach the highest power. You don't have to take the ranks seriously and think if Naruto or One Piece is stronger.
Peace :D
Weekly Power Status
-- Power
Ranking 
-- Power
stone