As the students went off to their internships, the crew had time to talk with the teachers about how they wanted to teach the students.

"You want us to teach the kids how to use haki?" Sanji asked as they were all at a field.

"Yes! We heard of you referencing this ability and we would like to know if our kids can use it." Nedzu asked.

"Well, not everyone can use it as they are either not aware of it or they don't have a string enough will. But it can give one a lot of advantages." Robin explained.

"There are three kinds of haki. Current understandings of Haki define three distinct types, each tied to a different ability: sensing others' spiritual energy to anticipate their movements, producing a protective coating of energy from one's own body, and—for a certain group of "chosen ones"—overwhelming the willpower of others." Jinbei explained.

"People who do usually awaken it through proper instruction and intense training. Haki is apparently quite difficult to master, and Zoro, Luffy, Sanji, Pachi and I had to crunch in two years just to know the basics." Yukiko explained.

"Really?" Hound Dog asked.

"Although there are exceptions. In very rare instances, a person can awaken their Haki on their own due to an experience of extreme stress or shock. And only a handful of people are actually born with awakened Haki, and are able to use it with no known training." Ace said.

"A person can also make their Haki become stronger, especially when they push themselves and their Haki to the limit and beyond in battles against far stronger opponents." Alina adds.

"Not only that, Haki is the true defining factor that determines whether or not someone can conquer the sea, because only Haki transcends all, unlike Devil Fruit powers or even Quirks, no matter how powerful they may be. One example is the late pirate king Roger. He conquered the Grand Line using his Haki, which the previous Yonko failed to do. His Haki was that strong." Yukiko adds.

The staff were astonished by this. So haki is more powerful than any quirk?

"Um, you mentioned three kinds of Haki. Just what are they?" Snipe asked.

"The First is called Kenbunshoku Haki, or Observation Haki, which gives the user a sixth sense of the world around them. It allows a person to sense the presence, strength, and emotions of other people, even if they are out of sight or far away. It also grants limited precognitive abilities, allowing the user to sense their opponents' intentions and predict their actions and attacks before they happen. Usopp possesses this kind of Haki, which helps his skills as a sniper. And he's a master at it. He also got it from his father, who's also a pro at this haki." Yukiko said.

"An advanced level of Kenbunshoku allows the user to actually foresee a short period into the future. I actually unlocked this form of Kenbunshoku after fighting Katakuri who could also see slightly ahead into the future. And he was not an easy opponent either. In fact he was three times my height." Luffy explained.

'T-three times?! What kind of world do they live in?!' Toshinori thought in shock.

"Unlike the other types of Haki, it has hardly any visible indication when being used, except for when the person has bright red pupils to warn of a coming attack, or even hidden opponents. This kind of haki can be best used by snipers, and is done best when in a calm state.

 Rayleigh also told me that to fully master this ability would allow the user to see others, even if they are concealed from view or too far to see." Luffy adds.

"This type of Haki allows the user to see another person through their aura, be it behind buildings, strategically hidden, or even camouflaged. But that's just the basic. Others include emotion sensing, strength sensing, but it can falter when losing concentration." Jinbei adds.

To demonstrate, Usopp took out his Green Kabuto, and aimed at something at about 2 kilometers, taking out an apple dead on.

"Amazing! Not even Snipe can hit something that far!" Power Loader said in shock.

"Wonder if i can learn it?" The cowboy wondered.

"Yeah but gaining it isnt easy. A sign to gain it is to dodge attacks 100 times in a row without stopping." Yukiko smiled to their shock.

"Anyway, the second type is Busoshoku Haki or Armament Haki. It allows the user to use their own spiritual energy to create, in essence, an invisible piece of armor around themself, providing incredible offensive and defensive capabilities." Yukiko then walked to Vlad and asked him to make a shield from his blood on him.

He did so and then Yukiko used her haki, punching him in the gut and he actually felt it.

"Ow, that actually hurt." He grunted.

"This an advantage to armament. It can be used against other Devil Fruit users, and from the looks of it, it can be useful against quirks that would otherwise kill you. Even elemental ones." Zoro said.

"With hardening as the basic form, the affected body part becomes stronger in terms of both offense and defense. Hardening increases one's attack power by a considerable amount, allowing the user's blows to become tremendously destructive and dangerous. Defensively, hardening serves as an armor which can safeguard the user from a great amount of attacks, particularly ones which are not clad in Haki themselves. But extensive use can lead to a depletion until you rest. And it's not just for people." Sanji said.

"Right. Armament users can also extend their ability to objects, only for a certain amount of time, depending how strong it is. Imbued weapons gain a new degree of offensive power, with one example imbuing arrows to blast through solid stone. Defensively, imbuing Haki into a weapon prevents it from being damaged as easily and increases its lifespan. Zoro has a great hold of this ability and he can extend it to all of his swords at once." Nami adds.

Zoro then stands up, looking at the man-made mountain. 

And before anyone could blink, he sliced it clean in two with only one sword.

"Oh my!" Midnight yelled.

"Not even the other sword wielding heros could accomplish that feat!" Ectoplasm yelled.

Aizawa was also amazed at this and wondered if he could use it for his scarf.

"Another level to this Haki is Ryou. So far, Luffy is one of the few people to unlock it. A step above the technique of emitting Busoshoku is having it flow into a targets body and destroy it from the inside out, which can be done by touching, grabbing, or even emitting Haki toward the object. This technique is also useful against objects which cannot be broken easily." Franky adds.

Luffy then went to a tree as he focused his Armament. And without barely touching it, the tree tore apart from the inside out!

"Imagine what that can do to a human..." Recovery Girl said in shock.

"It would NOT be a pretty sight..." Present Mic gulped.

"Well, you saw Observation and Armament...............

However, unlike these.......

Only one in a million people can unlock the rarest form of Haki..............

Haoshoku Haki, or Conqueror's Haki!" Yukiko said.

"Conqueror's? What does that do?" Nedzu asked curious.

Luffy and Yukiko smiled.

And then the heroes felt like a presure fell upon them, as if something terrifying entered their minds and souls, attempting to dominate thier wills!

Then it stopped and they fell to their knees feeling shaken.

"Sorry about that, but we only used a little bit of it." Luffy smiled.

"If we used it fully you would have passed out." Yukiko said.

"P-passed out?" Hound Dog asked.

"This haki allows the user to exert their own willpower over others. Unlike the other two types of Haki, this type cannot be awakened through training and only one in a million people are born with this ability. And unlike the other two, Conqueror's is achieved through lineage. Luffy for example can use it thanks to his parents and grandparents who all possess Conqueror's Haki. It's also said that those who possess this haki have the qualities of a king, and are called Supreme Rulers." Jinbei explained.

"Qualities..........of a king?!" 

"Luffy and Yukiko's Haoshoko is proficient enough to tame monsters, as well as knock out a selected group of individuals without affecting any bystanders. Although there have been times when one unlocks it at a young age. I was able to awaken mine when I was only ten." Ace explained. "The basic is domination of will making animals tame, andincapiciation involves individuals passing out. If used with a sufficient degree of power, Haoshoku Haki is capable of damaging inanimate objects and structures in the user's vicinity. Additionally, Haoshoku clashes between particularly powerful individuals have even resulted in a massive rift in the sky above them, known as "splitting the heavens"." he finishes.

This.............was a lot to take in.

Haki was very versitile yet very dangerous.........

"Well, let's see if any of us can be able to use it for now. If possible, I'd like to eventually teach our students so they would not have to rely on their quirks all the time." Nedzu said to the heroes surprise.

"Alright, who wants to go first?" Yukiko smiled.

------------------------

Later that day,

The pros felt like they did a six hour marathon run, as they tried to get air in their lungs as they all laid on the ground all sore.

"Now I know how a pinata feels at a birthday party......." Power Loader said.

"You should complain? Even my clones felt it...owowow..." Ectoplasm said in pain.

"And we really have to learn like this?" Midnight asked.

"Well, as they say, no pain no gain." Vlad Blood gasped.

"And we have to do this again tomarrow? Its gonna be torchure!" Mic yelled.

"No, we should be concerned for our students because they will learn this too..." All Might debuffed as he collapsed.

Nedzu just silently laughed at this.

Then they find themselves being greeted by two people.

One was a male, a tall, tanned, broad-chested, muscular old man. He has a beard and a scar over his left eye. His eye color is blue, and his hair is gray. He also wears a suit best for a marine admiral.

The other was a female. She had brown hair fading to silver, although she had little wrinkles around her eyes. She wore the traditional coat of a marine admiral like a cape, but her outfit consisted of a black t-shirt with the marine insignia and jeans.

"Excuse me, can you tell us where we can find a boy named Luffy?"

"Uh, yeah, and you are....?" Aizawa said in pain.

But then the man looked up as he saw Luffy, and was about to move when the woman hit him down to the ground.

"I said not to attack him! Besides, youre retired from hunting pirates!" The woman yelled.

Luffy was shocked as he saw the two people, despite not liking to see one, he ran to the woman and hugged her.

"Grandma! How are you? How did you and gramps get here?!" He smiled.

"Ultra wormhole. Wound up here for some reason. Now i know why. Making trouble again?" She smiled, oblivious to the heroes' stupified expressions.

"Wait...........a pair of marines.....................are Luffy's grandparents?!" Mic yelled.

-------------

"A pleasure, and thank you for helping our grandson and his crew." Rosetta bowed as she had Garp do the same.

"The name's Monkey D. Garp, retired Vice-Admiral, and this is my wife, Rosetta." Garp said proudly. "But why did you keep me from greeting my grandsons and my two grandaughter-in-laws?"

"Because one, i told you we are retired, we are not fighting family anymore. Two, you'll see in a few more months. And Three, you keep pushing them away with violence, especially when they became pirates."

"And that's why shes our favorite grandparent." Ace muttered.

"That was to toughen the boys up for the real world! The sea aint an easy place to live after all! For once, can't you be on my side of things?"

"For the sea part: yes. For everything else: Not then, not now."

Toshinori was shocked at this. He was seeing an elderly couple argue then looked over at Luffy and Yukiko who looked like they were still in their honeymoon stage.

"Uh, these are really your grandparents, Luffy?" He asked.

"Yeah, although gramps had to marry grandma, he got her pregnant with my dad. They stayed married for him." Luffy explained.

"Plus, Rosetta's the only woman that can keep up with Garp's antics." Yukiko added.

Yikes...Toshinori begins to wonder what Luffy's parents are like............

-------------

Somewhere in Oceania, a couple, finally together again after finally fulfilling their mission to create a proper government sneeze at the same time.

-----------------

Yup, it's Garp and Rosetta (oc), if you are interested, i welcome any fanart of Rosetta to help this fanfic. Same with Yukiko and Alina too.

Sorry I didn't get to Stain yet, it will take a little time......

For some oneshots, I will put up a poll for possibilities on Ao3 focusing on Luffy x Yukiko! I'll get it up asap tomarrow! I'll also add some with certain songs. Look it up late Friday!

But now I must rest!

plz comment!