Mato Mato no Mi.
While it was unexpected, Shinra gained the ability of this Devil Fruit as he showed the corpse of Vender Decken IX to everyone, causing all of them to be dumbfounded.
Frankly, it didn't take much time for him to take down Vender Decken, and while this guy might be one of the more noticeable villains, he wasn't strong, and pretty weak despite his unique Devil Fruit.
So, what was the unique part of the Mato Mato no Mi?
It allowed one to mark someone, and this mark was impossible to remove, and with this mark, Shinra, the user of this Devil Fruit, could send anything to the one that he had marked, whether it was weapons, food, or just find the one that he wanted to get.
Frankly, he wasn't sure about the potential of this Devil Fruit, but for one thing, he should improve this Devil Fruit so that it would allow him to mark others without the need to touch them.
"How?"
However, when he returned, Neptune and the others couldn't help but ask this question.
How could Shinra swim in the ocean and breathe like a mermaid or fish-man?
"What did you say?"
"..."
Facing this question, Neptune and the others quickly realized that they weren't in a place to ask Shinra a question. They were on the weak side, the lower one, so how could they ask him a rude question?
As for why Shinra was able to gain the ability to swim and breathe underwater, of course, he had used the ability of Eye of Usurp on Hody Jones before gaining the ability to swim like the mermaid or fish-men, but of course, he wouldn't say that, and he wouldn't say anything.
Yes, while there was a chance that they might tell everyone about his ability to breathe underwater, Shinra didn't really mind, as he could use it as a way to test all the people in this kingdom.
Still, they didn't forget about their promise.
"Here's all the reward."
All of the treasuries had been emptied by Carina, so they had to obtain a substantial amount of money for Shinra, which was accepted by Carina, whose eyes had turned into a symbol of bellies.
"By the way, what's the work that you have said before?"
Before Shinra left, everyone still remembered his words, who asked them to work together for something.
If it was before, they might wish for Shinra to leave immediately, but as they saw how Shinra was able to breathe underwater like a mermaid, and even killed Vender Decken IX, they felt an affinity toward Shinra as a certain thought emerged within him, yet with how handsome he was, it should be possible, right?
Shinra wasn't sure what they thought, but he looked at Neptune and asked, "Have you heard about underwater mining?"
"Underwater mining?"
Yes, what was valuable about the Fish-Man Island had never been the island itself, but the mermaids and fish-men that worked within.
As he had gained the ability of Suna Suna no Mi, he could detect everything within the sand, and naturally, under the ocean, sand existed, so like in the Arabasta Kingdom, he could notice what was contained within the ocean, including precious minerals and even many resources.
As fish-men and mermaids could breathe under the water, they were naturally the best workers for this undersea mining project.
Still, as important people gathered, listening to Shinra's project, all of them knew that this was an important project that could change the fate of all of them, as it would give the fish-men and the mermaids value, money, and naturally a connection to Shinra, which made them protected by him.
This project would give Shinra a lot of money, and at the same time, it would also help the Ryugu Kingdom to solve the criminality in their kingdom since the source of piracy, criminals, and all other bad things in their kingdom was due to the poverty.
If those fish-men had money and could live in comfort, would they become a criminal?
When the merits and amount of money were expressed on this project, whether it was Carina, Neptune, or the others, they became excited.
As the land was limited, Shinra knew he should look to the sea to seek wealth, and naturally, he needed workers; the best workers were presented before him.
"When can we start this project?"
Who cares about what Shinra did before?
In front of the overwhelming benefits that came from working together, someone could even sell their soul to the devil!
"Wait."
"Wait till when?"
"Until I make my name and have a power that is comparable or better than the Four Emperors."
"..." Everyone.
This project was the first of its kind, and since a significant amount of money would be generated, they needed someone to protect them.
As their kingdom was located at the bottom of the sea, it also served as a natural barrier that protected everyone from those greedy people. Still, this wasn't enough, and they needed someone so powerful that they could protect them from anything, and that answer came from Shinra, and the little princess, who had learned that she could live outside peacefully.
"So, this is where Mom is buried..."
Shirahoshi, who was targeted by Vander Decken, couldn't even visit her mother's grave, and so when she was saved, she wanted to visit her mother's grave.
"Is this alright, Your Majesty?"
"Why not? Even if I want to stop them, do you think it is possible?"
"....."
In the castle, when Shinra, Robin, Carina, Shirahoshi, and the others walked toward Otohime's grave, Neptune and the others started their conversation about Shinra, who had made such a plan.
Unlike Otohime's unrealistic plan, which wished to live on the surface just by asking the people in this kingdom to sign an agreement that they supported her to live on the island, thinking that all the human would definitely agree to let them live on the land, Shinra's plan gave the fish-men and mermaids a value that they had never thought of before.
Even if they didn't do anything, as they would show this value, many kingdoms would beg them to live in the same place as them, as they would generate a lot of money for them.
In front of money and interest, all other things could be put aside!
Yet, Neptune sighed inwardly, never thought that the one who saved this kingdom would be the one who was about to destroy this kingdom.
"By the way, did you ask how old Shinra-sama is?" Neptune quickly asked and changed how he talked about Shinra.
"Er... if I am not wrong, he is about to become 17."
"That's great! Only four years difference!"
"....." Everyone.
"But, let's wait till she becomes an adult first."
"That's right."
As for Robin and Carina, it didn't matter since for the strong, wasn't it normal for him to have more women by his side?
This was an investment, an investment toward the sovereign that would rule and colonize this planet.
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By the way, do you have any ideas on how to develop Mato Mato no Mi further?