Start by Eating Jake Jake no Mi

Rikudou. 

It is an esoteric mixed martial arts style with a focus on both armed and unarmed combat. Rikudou's techniques are specifically designed around killing their opponents.

This was the martial art that had been learned by the Fourth Masa and used by Masa from One Piece in the previous chapter. 

There was no problem with this technique, and it was fairly powerful, but it was developed by the Army of God based on the martial arts formerly used by members of the Communist Party army.

The Communist Party wasn't the problem; the problem was the Army of God, as it was an ultra-radical religious cult that planned to use chemical weapons to do biological terrorism and a coup d'etat to the country with a purpose for the salvation of humanity. 

'...I hope that the fourth Masa is fine.' 

Nevertheless, he wondered whether all of the martial arts in the world of Fourth Masa could be combined with the martial arts in the world of One Piece, DxD, and Mahouka. 

While it might be his guess, the world of the fourth Masa must have deep research about martial arts, and naturally, this martial art couldn't be underestimated even though it was unable to destroy a skyscraper or an island. 

If there was a reason why Garp could blast an island, it was all due to his physical ability instead of the martial arts. 

In other words, if the martial artists in the world of the Fourth Masa had the physical ability of the people in the world of One Piece, then they could even be better than those in the world of One Piece. 

This was also the reason the Rikudou martial art technique that Masa used previously could blast off everything in its path, and it even blasted some weak members of the CP9, who weren't prepared for the impact of his attack. 

Nevertheless, with this, the role of the fourth Masa was clear, and that was to create the best martial arts for all of them. 

However, at this moment, the group of six of CP9 had become a group of two. 

Yes, only two stood up, and the rest all fell away due to Masa's "Sunder Heaven," the ultimate punch of the ultra-radical religious cult, completely wrecked as they moaned painfully and wounded by the blast of compressed air and impact. 

Still, Masa felt a bit helpless when he saw the destruction that he had caused to this island. 

'Well... it's all due to the World Government!' 

With ease, Masa put all the blame on the World Government. 

Still, before that, let's enter the act first. 

"Oh?" 

Masa appeared surprised when he saw two people in the CP9 standing up slowly, yet weakly, so he couldn't help but give the two some advice, "How about you lay down? There is no point in fighting anymore, you know?" 

While in the original arc, Luffy and his group might be troubled by CP9, in Masa's eyes, they were just so-so. At best, they were mid or about the vice-admiral levels, and it was impossible for them to reach an admiral level. 

Well, Rob Lucci might have a chance, but with his Devil Fruit? 

Unless Rob Lucci had an ability like Masa's, his fate was already clear. 

Nevertheless, Rob Lucci and Kaku fell into silence, and their expressions were solemn; they felt the danger they hadn't felt before. 

This guy was hiding his power, they thought. 

Unlike Masa's previous harmless and gentle aura, which was like gentle sunshine during the day, at this moment, he was like a gigantic sun that would burn those who got close to him. 

If they did nothing and just remained in disguise, pretending to know nothing, then nothing would happen, yet they were too close to the sun, burnt, like Icarus, before dying. 

More importantly, they knew their chance to defeat this guy was as good as zero. 

Yet—

"Kaku, can you fight?" 

"Haha." Kaku laughed and took out two swords that he had hidden on his back. "I am the best swordsman in CP9! How can I lose just like that? Come on! Fight me, Lucci!" 

"It's you who should follow my lead!" 

Unlike Kaku, who was wounded, strangely enough, Lucci's wounds started to heal, and his body grew larger as he turned into a monster. 

No, it should be a gigantic humanoid leopard, a monstrous creature that brought terror to those who saw him. 

Neko Neko no Mi, Model: Leopard. 

Masa's eyes were focused on Lucci, and he tried to observe this genius agent, who was known as the most talented within 800 years. 

Still, the genius aside, he was more cornered about the ability of this Devil Fruit, and at the same time, he tried to use the ability of the House of Vapula. 

Would it work? 

After all, Lucci had gained the DNA of a feline-type related creature, so Masa should be able to control him, right?

Then, as expected—

Lucci suddenly lost control over his body as if he were a mindless doll under the ability of Masa of DxD. 

If it had been two years later, Lucci might not be as helpless as now, but there is no "if" in this world. 

Still, even if two years later Lucci became stronger, Masa would also become even stronger. 

"COME ON, LUCCI! ATTACK WITH ME!" 

As Kaku announced his intention to attack, he leaped, moving so fast that it was as if he had disappeared before suddenly appearing at the top of the sky as if he was flying. 

Geppo (Moon Step)! 

This was one of the ultimate martial arts of the World Government that allowed a mortal to soar into the sky! 

Yet, this wasn't the end, as Kaku suddenly held his two swords, and his legs were pulled as if he were ready to kick Masa, who was in the distance. 

This should be impossible since there was a considerable distance between them, so how could Kaku attack Masa? 

"Rankyaku (Tempest Kick!)!" 

As his voice fell, countless compressed air blades were shot in Masa's direction, ready to slash him to death! 

Yes, similar to Geppo, Rankyaku was part of the Rokushiki, which allowed the user to send a powerful, sharp, compressed blade of wind by kicking! 

Moreover, Kaku was also a talented swordsman, and he was able to send compressed blades of wind with his swords. 

However, Masa was also a swordsman. 

"Huh?!" Kaku was dumbfounded when he saw Masa suddenly holding a black katana, which was as dark as an abyss. Shuddering, he realized this young man was even stronger than he had imagined! 

Run away! 

This was on Kaku's mind when he saw Masa take out his blade, yet it was too late. 

Also, why didn't Rob Lucci join him to attack Masa?!

Nevertheless, under the bombardments of Kaku, Masa was as calm as the surface of the water and held his sword in a sword in Iai-stance, then—

Click! 

No one saw when Masa drew his sword, but after that click sound, all of Kaku's compressed blades were cut down, including Kaku's body, into half before he fell into the ground, leaving only Lucci, who was still living, as he was under the control of Masa. 

'My fourth Devil Fruit.' 

Was it the right choice? 

Masa couldn't help but ask this question since there was no doubt there were many better Devil Fruits than this Neko Neko no Mi Model: Leopard. 

However, if their assumption was correct, then they would be able to develop this Devil Fruit further. 

Or rather, if they couldn't do it, they could use the power of Jake Jake no Mi to devour Manticore and Griffon in the world of DxD. 

As for the Sphinx, it was too ugly, so Masa didn't plan to do anything with it. 

'More importantly, the Nemean Lion.' 

This was his target, and the reason why he wanted to devour this Devil Fruit was because he wanted to evolve it into Neko Neko no Mi, Model: Nemean Lion. 

Why the Nemean Lion? 

It was because he was a Devil of the House of Vapula; if he was a Devil of the House of Furcas, he would get a horse-type of Zoan Devil Fruit.

Still, as a Devil of the House of Vapula, all the feline-type creatures would be under his control, and it would definitely be easy for him to develop this type of Zoan into an "Awakening" state without being afraid of his conscious being affected by the conscious of the creature within the Zoan type of Devil Fruit. 

So, Masa didn't hesitate since it was too troublesome to go after Who's-Who as it was too far away, so Lucci was his target, and facing Lucci, there was no fight or what over the moment Rob Lucci ate the Neko Neko no Mi, Model: Leopard; Lucci was as good as a slave in Masa DxD's innate ability. 

So, as he made up his mind, Masa devoured his fourth Devil Fruit. 

---

To be honest, his Zoan-type Devil Fruit can be anything since Masa can devour all types of beasts, but what is important is the trait of the Zoan Devil Fruit, "awakening," and compatibility, so I choose this one, which he will try to improve on the world of DxD that will appear soon.