One Piece: Unreal Adventure

"Come on brat. Let's see how much you have been slacking of the past year." Garp said as he folded the sleeve of his shirt.

Opposite of him, Luffy stood with his naginata drawn. "You will be surprised, old man." Luffy grinned, tightening his grip on his weapon, Horn's edge.

'I can't use any of my rokushiki techniques, but that doesn't matter. I'm already way stronger than I was a year ago. This might be the only fight that might break my limits… I just hope that I don't break too many bones doing it.'

After the previous visit, Garp didn't show up for a full year. And when Luffy had asked him, he told him that a pesky pirate from the Grandline was creating some problems in the west blue so Garp didn't have time for a visit.

Understandable in a way. But Luffy actually missed the old man. Garp didn't show it, but he cared about Luffy and the boy kinda liked it.

Also, without Garp getting here, his training had reached a plateau. Or in a more wuxia way of saying that he reached a bottleneck. Now he wasn't gaining any strength at all, or whatever he did gain was too small.

Technique wise he improved a lot. Mastering all of the Rokushiki techniques, even the seventh one. And he was even on his way to developing variants from those techniques.

But strength wise he reached a limit. Physical strength was important. The strongest men in this world could break mountains, cut a whole island in half or even a whole fucking meteor to pieces if needed. And that required raw strength along with technique.

And that couldn't be gained with routine exercise it seemed. That was kinda sad. But it was kind of expected.

From what he read from the Rokushiki book, one needs to face danger to grow stronger. It seems that extended to all aspects. Both physical and technique-wise.

Luffy kinda felt jealous about people like Oden, Kido, or Big Mom right now. Those guys were literally born with their strength. And if he didn't break his limits he wouldn't be able to suppress them.

He remembered from the anime that the canon Luffy only trained after the war and in Wano, but even then he was able to suppress Zoro every time. While the green-haired swordsmen trained hard each day. And funnily enough, Sanji was able to kinda keep up with him.

But there was also a theory that, while Zoro was training his ass off. Sanji was fending off Luffy from the fridge. And going by One Piece logic, it might have been just as effective.

Jokes aside. The main reason the crew grew stronger was because they faced dangerous opponents. Which thinking back did make sense.

Luffy had trained hard these past years, training with Sparky all that effort wasn't for nothing. And that was why he asked Garp for an all-out fight. The old man refused at first, but after explaining and a lot of pestering he agreed.

Now it kind of made sense why Garp would put both Luffy and Ace in dangerous situations on the island. But the thing was there wasn't anything on this island that could even be a possible threat. And, that's why he needed some hands-on experience.

Both grandson and grampa were in a forest clearing, no animals other than Sparky were even near the vicinity. But even Sparky the six-armed monkey was taking a good position to not become a casualty. Of course, Luffy's straw hat was on the monkey, he didn't want to damage it.

"Brat, ready whenever you are…" Garp couldn't finish his sentence as he had to duck from a wide swipe from Luffy's blade. "Huh, impatient are we?" He moved forward and did a wide uppercut toward Luffy's jaw.

But Luffy's figure disappeared, making the wide man look to the side. The rubber boy had a red skin, steam coming out of it. "Gear Second."

"Now, that's something impressive, but can your speed really keep up…" Garp dashed forward. This time he used soru as he appeared right in front of Luffy punching the boy in the face, only for the boy to move slightly away avoiding the punch. It was as if he moved on instincts.

Garp was wide-eyed, and caught off guard at the same time. And Luffy used that chance to plant a foot on the man's stomach. It made him back away a few steps, but Luffy didn't let go.

"Gomu Gomu no Jet Gatling"

Garp grinned, avoiding each punch with ease by twisting his body around the punches, not getting hit. It wasn't kami-e, no it was pure skill of Observation Haki. "And that's how you use the color of Observation, brat."

With that Garp again appeared right above Luffy's head and punched downwards. But Luffy knew that he couldn't stop the punch so he did the only other thing and tackled the old marine. The rubber boy's body got bulkier as he combined gear two. "What the…"

"Haa!" Luffy planted his right foot forward as he took the full weight of Garp and body slammed into the ground.

"Why you…" but before Garp could grab him Luffy used his speed to get far from the old man.

The old man didn't say anything as he stood up, dusting his clothes. But he looked pissed. Luffy gulped, but he calmed his nerves, he needed to do this. No backing away now.

Luffy tightened his grip on his naginata, swinging it in horizontally. "White Slash!" A wide ark of wind blade made it towards Garp. This was the next level of cutting steal as a blade user and as a geek, he loved his flying slashes. However the naming needed some work.