They Should've Know Logia Weaknesses

"Look at how are you right now. you guys need more training if you want to sail into the grand line." Izumi said to luffy and the others after they fought arlong pirate. They had lot of wounds in their body. When they were fought, izumi just stand aside and not interfere their battles.

Since izumi is just like a guard that guarding the water from arlong pirate, they won't have a chance for winning. So in desperate situation, arlong and his two officers rush toward izumi like mad beast, but izumi take care of them instantly.

Izumi only kill arlong and chew, but he let hatchan go as he said "Tell that shichibukai, jinbei. Don't let people like arlong roaming outside fishman island, or catastrophe will descend on your island. The culprit is either Pirates or World Government." Then izumi throw hatchan to the sea.

A day passed by.

Right now, all people in cocoyasi village celebrates after the defeat of arlong pirates. Luffy, zoro, sanji, and usopp have been eating and drinking with bandage all over their bodies.

"Izumi, you are stronger than luffy. And you also smarter than him. Why did you let luffy become a captain?" Nami suddenly ask him. Izumi just smile at her and say.

"Well, that guy has ability to make friends everywhere with his cheerful personality. He also cares about his friend. Moreover...."

"Izumi, nami. Come here!! Let's eat together." Luffy cut izumi's word.

"Well, I'll tell you the detail later!" Then izumi joined luffy and the others.

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The next day, Luffy, izumi, and the others already on the ship, except nami as they waiting for her before sailing.

"She's late."

"Why did she takes so long?"

"Girl problem?"

"I think she won't go along with us."

"What are you saying? Nami-chan must be prepare something."

All straw hat crew began to argues. Well, considering her village was freed from arlong pirate, it wasn't impossible for her decided to stay in the village.

After a while, they decided to leave without nami. Though, luffy seem unwilling to look another navigator.

"Look, it's nami!" said izumi.

Then the others turn their head. They asked her to hurry up.

Nami run toward the ship while passing through the crowd, then she jumps.

Landed on the ship, nami take out a bunch of wallets as she say "thanks" to the villagers.

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"Where are our next destination?" asked luffy to nami.

"Look here!!" Nami opened the map of east blue. She pointed at certain point which like a five ways of river and an oval shaped which is certainly an island.

"This is reverse mountain. It's only a way to get to grand line. And this one is loguetown. We need at least more than a week to reach this place. And we need to get a lot of supplies such as equipment, food, etc." Said nami.

"That's right, I need a swords too." said zoro with tapping his broken katana.

"I want to see the execution place of the pirate king." Luffy grinning excitedly.

"As expected of nami-chan. by the way, what is that damned izumi has been doing?" asked sanji.

Right now izumi takes out his stuff and make something like motor, or it could be said an engine.

"What are you doing izumi?" Luffy asked as he stretch out his hand toward izumi's stuff.

*slap*

"It's not done yet. I'll lend it to you if I'm done." said izumi as he slapped luffy's hand. "Since merry go is too small, I can't make speedboat, so I've trying to make jet ski."

"Speedboat?"

"Jet ski?"

"What is that?"

They asked curiously since it were their first time to heard something odd.

"Ah, speedboat is just like it's name. The boat which could move in fast speed. Depend on the size, it could carry 4 to 8 people. But of course can't carry too much luggage. Otherwise the boat will sink."

"As for jet ski, it's something like bikes but in the water. Can only carrying 2 people at most, but same speed as speedboat." Izumi explained to luffy and the others.

"Cool" luffy's eyes shining when he heard izumi, although he barely understand what izumi said.

"That's amazing. It could help us when needed." nami said cheerfully.

"Anyway, luffy."

"Yes?"

"Do you know that there are three types of devil fruit?" izumi ask luffy as he assembling the part of the engine.

"I'm not. Is there any difference?" luffy asked back. The others also doesn't really understand except sanji, since he was the only one who research devil fruit.

"There are 3 types devil fruit if I'm not wrong." sanji said with his hand holding his chin.

"Yes, 3 types, which is paramecia, logia, and zoan. Luffy's devil fruit is paramecia type, the most common devil fruit among the three. Zoan is devil fruit which make you transform into animal species, mythical beast included. Last one is logia, it is considered the rarest and strongest type devil fruit."

"Logia devil fruit is the elemental type, such as fire, water, lightning, wind, earth, light, dark, and even poison. It's also most troublesome because the user of this type devil fruit can transform his body into element correspondence of his devil fruit, so any physical attack wouldn't work." explained izumi.

"Transform his body into element?" asked luffy.

"Wait wait wait. Did you mean you can't hurt logia user?" nami asked with surprise.

"The most important thing is, how to defeat." zoro said seriously.

Sanji and usopp just silently waiting for izumi to speak.

"There are 3 ways to defeat logia users. First is drown him in the water just like what I did to luffy in cocoyasi village." What izumi did to luffy was using ninjutsu Suiton: Dai Bakusui Shouha, a gigantic water dome. It's just similar to Suirou no Jutsu, a water prison technique, but bigger. That ninjutsu is trapping people in the water, and it seem that gigantic water dome technique works against any devil fruit user. Izumi thought only sea water was the weakness of devil fruit user, but didn't expect any water would do. And when izumi used that ninjutsu to luffy, luffy instantly lost his strength as he drowned.

"The second one is counter his logia element. For example, if you meet mera mera no mi user, use water element against him since the water is the weakness of fire element. Look at this!!" then izumi draw the element chart based on star guardian from a game he had played long ago, Fire > Wind > Earth > Lightning > Water > Fire. It's standard elements weakness and superiority. Then izumi continue telling them. "Well, in any case, you can counter it with other thing, just like luffy's body which could counter lightning type logia."

They nodded furiously as they began to think seriously when they meet logia devil fruit user. Then luffy asking the third weakness.

"The third one is Busoshoku Haki."

"Busoshoku Haki?" They asked at the same time. The only thing they know is, learning Haki is very hard. Even izumi was just barely awaken Haoshoku Haki and still doesn't know how to forcefully awaken it. As for the other remaining Haki, he had a plan to train it.

"Yup, Haoshoku Haki, you surely remember what I had told you, right?" said izumi.

"Yeah, using energy within the body to harden your body or weapon, something like that isn't it?" nami ask in doubt.

"Yes, something like that. I have to tell you all of this is to make you ready to face one of those people on grand line." said izumi.

Nami and usopp shuddered.

"Wooo, I'm fired up!!" said luffy as he raised both of his hands cheerfully.

"There's a lot of strong people in grand line, huh." said zoro with his scary face.

"As long as I'm with nami-san, anywhere is acceptable." sanji grinning ear to ear with his eyes change into heart shape.