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One Piece: Starts With Vampire Devil Fruit

Karl D. Sephiroth finds himself unexpectedly transported into the vibrant world of One Piece. On the brink of being sold into slavery, join him on a thrilling journey as he rescues the Boa sisters and embarks on a new adventure in this unfamiliar world. --- Support Me: patreon.com/AnimeWrite --- Please Note: I do not own anything in this fanfiction. The copyright belongs to their respective creators.

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20 Chs

Internal Combustion Engine!

Chapter 13 - Internal Combustion Engine!

Scrap Island

Tom, Iceburg, and Franky, along with a giant frog named Yokozuna, stood in front of a steam locomotive.

It took them three days to assemble it. And, finally it was ready for trial.

Franky was so excited that he hugged the frog Yokozuna and shouted happily.

"Tom-san! It's great; we've finally assembled the locomotive. Next, we just let it run on the sea track successfully, then your dream will finally come true!"

"Hahaha! It's still early! Let's give it a trial run first!"

Tom laughed and hugged the locomotive with both hands.

In order to test whether the sea train could run on the sea, the three of them had already built a short-distance track near the coast of Scrap Island.

Under the terrifying power of this horned fish man, the steam locomotive head, weighing tons, was easily lifted up and placed at the starting point of the track.

Before Tom could say anything, Franky's eyes flashed with golden light, and he volunteered:

"Tom-san, let me drive this train!"

"Hahaha! It seems that you can't wait any longer, so it's up to you to start the train!"

Franky chuckled, quickly ran into the front power room, started adding coal to it, and lit a fire.

A moment later, steaming black smoke came out of the smokestack. With a 'clang, clang' sound, the locomotive drove out slowly, and the metal wheels spun faster and faster.

However…

As soon as the front of the steam locomotive drove less than twenty meters away, the entire front of the locomotive fell uncontrollably into the sea. Franky was so frightened that he quickly abandoned the carriage and jumped into the sea, thus escaping the fate of being buried under the sea.

Seeing this, Tom quickly jumped into the sea with a "plop" sound and made a big splash.

He wasn't trying to save Franky. He knew the latter's swimming skills very well. As long as Franky wasn't thrown into a huge whirlpool of ocean currents, he could basically swim back alive and kicking.

What he wants to save is the steam locomotive!

If every time he failed, a steam engine was scrapped, his wallet couldn't bear the expenditure!

The fishmen were the darlings of the sea. Compared to land, they could fully display their racial talents in a water environment.

Soon, Tom descended from the bottom of the sea, carried the front of the steam engine on his shoulders, and climbed up to the shore.

Franky, who had just swam to the shore from the sea, shook his wet blue hair and said with a speechless expression:

"Tom-san, isn't the engine you built supposed to sail on the sea? Why did it fall into the ocean..."

Hearing this, Tom suddenly laughed and scratched his head.

"Ah hahaha! There is nothing we can do about this… When this happens, in addition to insufficient buoyancy of the suspension devices of the track and the train body, there is also the fact that the speed of the sea train is not fast enough... I'm very troubled by this fact! If the efficiency of the steam engine can be increased from 8% to more than 15%, it should be able to enter a state of equilibrium, I guess?" Tom shared his thoughts.

"What if another mechanical device is used to provide power, and the energy efficiency can reach more than 25%, or even 40%?"

Hearing this somewhat familiar voice, Tom turned his head in surprise and looked at the silver-haired boy walking slowly.

"If that's the case... then it couldn't be better! Maybe, the sea train will be able to travel directly on the sea, hahahaha!"

"Oh!? Then I think you should be very interested in this thing."

Sephiroth showed the rough design drawing in his hand in front of Tom.

"Can you tell me how it works?"

Shipwright Tom looked at the mechanical schematic diagram and the rough cross-section diagram of the internal combustion engine in the young man's hand, and he couldn't help but fall into deep thought.

He dared to boast in front of the judge that a sea train connecting multiple islands could be built within ten years.

That's because his mechanical engineering attainments are very good. He knows that as long as he breaks through certain technical difficulties, he can turn the sea train into a reality.

Therefore, when the shipbuilder Tom saw this internal combustion engine drawing, he understood a lot of things instantly.

"This is a heat engine that uses diesel as fuel and can convert heat energy into power..."

Sephiroth told the world's number one shipwright in One Piece the knowledge he had learned about internal combustion engines in high school in as much detail as possible, hoping that the other party could understand the existence of this kind of machine as soon as possible.

Franky forced himself over. After listening to the silver-haired boy's explanation, an excited smile immediately appeared on his face:

"Tom-san, this thing sounds so interesting! I think we can give it a try!"

"Hahaha! It's really good! Brother, you are actually willing to tell me the principles of this machine. You are truly a remarkable person!" Tom praised Sephiroth without hesitation.

Since as a shipwright intern Franky could understand it, so as his teacher, Tom would have no problem understanding the principle of the internal combustion engine.

"Brother, can you show me the relevant part size drawings?"

Hearing this, Sephiroth shook his head decisively and said casually:

"I don't have anything like that at all. It's all theorized."

As a surgeon, if someone asks Sephiroth to talk about surgery, he can talk about it in detail and explain it clearly.

But…

Mechanical engineering?

That's a profound and equally challenging topic, it's really a bit difficult to explain without a sufficient knowledge base!

"Oh! That's it! Then brother, you are also very powerful… By the way, what's the name of this machine?" Tom asked with a smile.

"Internal combustion engine." Sephiroth didn't hesitate to answer.

After chatting with Tom about the internal combustion engine, Sephiroth took the Yagara Bull and headed home.

Leave professional matters to professionals.

When it comes to the sea train project, providing direction is all he can do.

Of course, it was not without extra gains. At least, he gained favors from Tom, Franky, and Iceburg.

If he needs help from the three of them in the future, given their personalities, as long as it is not too troublesome, they will probably help...

When Sephiroth returned home, a guest had already arrived in his living room, and the three Boa sisters were sitting on the sofa next to the guest, waiting for his return.

The guest was the president of Hughes Shipbuilding Company, Hughes Silk. He was a tall, red-haired middle-aged man wearing a black starched suit and had a tough face.

"Sephiroth, it's really you... It's great that you're okay! I heard that your passenger ship was attacked by pirates... By the way, where is your father, Pal?" Hughes Silk asked with excitement.

"He was killed by pirates to protect me..."

As he spoke, the silver-haired boy sighed, his eyes a little sad.

The man named Karl D. Pal was a great father who could sacrifice his life for his son.

Karl D. Sephiroth's mother died of illness not long after he was born, and his father raised him alone.

Therefore, in his predecessor's mind, his father is the most important existence in his heart...

Hearing this, Hughes Silk also sighed slightly. He looked at the silver-haired boy and said solemnly:

"Let's do this! Sephiroth, how about you come to work in the shipbuilding company from now on? Although the company is in a recession now, if you come to work in the company, you will also have a stable income..."

"No, thank you for your kindness! Uncle Silk, to be honest, I am going to join the Marines..."

Hearing this, the three Boa sisters next to them suddenly shouted in unison and exclaimed in surprise:

"Marines!!!" x3

"Sephiroth, why do you want to join the navy?" Boa Hancock frowned slightly, her tone full of doubts.

"Because...! Not only do I need power, but I also need a force that rivals the Beast Pirates in order to take revenge… Joining the Marines is my best choice at the moment."

The silver-haired boy's eyelids were lowered, and there was no emotion or anger on his face, but his tone sounded very firm.

The Marines of the One Piece world are established by the World Government and specifically serve the World Government's participating countries and the world's nobility.

The Marines have no right to interfere in other countries' internal affairs, let alone disobey orders issued by the World Government. Their duties are only to maintain law and order in the sea, combat pirate forces, and help the World Government do some dirty work. Sometimes the Celestial Dragons even kill people legally, and the Marines are required to wipe their asses.

However, even if the Marines have various constraints and shortcomings, it is undeniable that they already have a fairly mature system in training talents.

Anyway, after this period of training, Sephiroth has finally figured out that it is true that he has Conqueror's Haki and a Mythical-Zoan Devil Fruit, but he does not have a systematic way to become stronger and cannot bring out the maximum potential of these powers without proper guidance.

As a result, even if he spent tens of hours exercising every day, he only felt a slight improvement in physical fitness. And in terms of combat experience, he was almost a blank slate...

In this world, there has always been no shortage of top heroes who grew up from constant fighting. Roger, Kaido, Charlotte Lingling, Edward Newgate, etc...

But…

Compared to their savage way, Sephiroth, who received systematic education in his previous life, still believes in training in a systematic and professional way, and the navy is the best suitable for this.

"Is that so? Strength and background are both necessary..."

Boa Hancock was thoughtful and murmured softly.

Seeing this scene, Hughes Silk stood up from the sofa, gently patted the silver-haired boy on the shoulder, and sighed:

"Alas! Sephiroth, now that you have made your decision, I will no longer advise you against it. If you need any help in the future, you can come to me..." Hughes Silk could only say so.

"Thank you, Uncle Hughes." Sephiroth thanked the friend of his predecessor's father.

---

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