When Kaido merged with the soul of an unlucky transmigrator, he learned that the world he was in was a manga, and that he was merely a stepping stone for Luffy, the so-called chosen one of destiny, to defeat him.

"What kind of bullshit is Wang Luffy, Chosen One, Joy Boy? I'm going to smash you all to pieces..."

'Ding, system loading...'

Kaido: "So this is the cheat code of that unfortunate transmigrator? It seems that after merging with that guy's memories, I not only know the direction of the plot, but I also have a cheat code to use..."

'Ding, system loading complete. You are not the host of this system. The system will automatically unbind you. Goodbye...'

Kaido: "Damn it..."

(Cheerful, cold-blooded, ruthless, bloodthirsty, ambitious. Kaido is the Kaido from the original work, but one who knows the plot; his personality won't change much.) (Completed novel: "One Piece, Me, Marco, Starting with the Marineford War")

The protagonist, Dicas, is transported to the world of One Piece and becomes a stray cat. Just when he is lamenting the tragedy and helplessness of life, the strongest cat god system descends. Watch how the protagonist improves his strength, how he uses the system to summon cats from the anime in his memories, and how he leads them to make a name for themselves in the sea world and make a name for their cat clan.

Rainbow Cat: "Let me, Rainbow Cat, the greatest swordsman of the cat clan, learn about the swordsmanship of this world."

Doraemon: "Rainbow Cat, wait a minute, let me get out the Lightning Ball to help you."

Dorami: "Wait a minute, brother, watch me use the shock gun in my left hand and the air cannon in my right to help you."

Meow: "I can do anything except catch Pikachu."

Talking Tom: "Me too. I'm invincible except for catching Jerry."

Star Cat: "Come and experience the charm of martial arts, magic, and wisdom. Here I come."

Abu: "Let's forget about the above. How about I show our enemies what the combination of technology and strength really means?"

Stingy Cat: "Come and experience the power of this Cat King's Explosive Red Fang."

Black Cat Sheriff: "I bet your bullets won't curve."

Blue Cat: "Hehe, do you know why I'm the leader of the Dragon Riders?"

Gatomon: "Let me destroy you in the name of the angels."

Tomorrow's Bright Moon: "We, the cat clan, will remove all obstacles."

Xiaoqing: "Let me tell you what it means to overcome strength with softness?"

Sugar: "Do you know what it means to break through force with speed? It's simple, just let me eat my fill of fish balls."

Whirlwind Claw: "I am the number one constable in the world."

The world of One Piece is silent and shocked.

[One Piece, summon, cool story, system, upgrade, invincible]

Travel through time and become Luffy, and bind to the invincible system.

It is my destiny to aspire to become the Pirate King.

Being targeted by Nami is naturally the benefit of choosing to be the Pirate King.

Lu Ming used to regard the Celestial Dragons as termites and scum. When he traveled to One Piece and became a Celestial Dragon, he found that being a Celestial Dragon was really nice. He could drink the best wine, play with the best women, and command the admirals to come and go at will. The only thing that made Lu Ming dissatisfied was that there were too many people sharing power with him. So Lu Ming sprayed his hair with hairspray and stood in the sky of the holy land of Mary Geoise: "This world only needs one Celestial Dragon!" PS: More women, more Celestial Dragons

What to do when you're out at sea without a ship? Allen: "Steal someone else's." What to do when there's no one on board? Allen: "Dig someone else's." What to do when there are people but no supplies? Allen: "Rob a warship." Treasure, famous swords, Devil Fruits, where do the women come from? Allen: "Brothers, look! There's a transport ship that's practically floating on air, it has everything!"... Transmigrating to the world of One Piece, relying on Baki's cheat abilities to rise to power in the East Blue, starting with just his fists, he steals everything—people and ships. My name is Allen, and I advocate for freedom. (A million-word completed high-quality One Piece fanfiction is already available; readers are welcome to jump in and get crazy!)

"Uchiha of the One Piece World," "Marine Admiral," "Smoker's stepsister," "The Celestial Dragons' lifelong nemesis," "Is Sharingan + Ice Release + Devil Fruit a viable combination?" "Ancient Zoan - Snow White Wolf!" "The Navy's peak of handsomeness in 800 years!"

With the aim of hunting down the Celestial Dragons, he used a dual identity to rise through the ranks of the Marine Headquarters, becoming the youngest admiral in history!

Borsalino: Compared to that brat, we're ashamed to be called monsters.

Sakazuki: Although he's an ice-wielding guy like Kuzan, I felt this kid's burning sense of justice!

Kuzan: Compared to that, my fighting style seems incredibly crude.

Sengoku: He will be the future of the navy! A pillar of the navy! (Most importantly, his face boosted his recruitment rate by several points.)

Garp: I have a feeling... this guy will unleash a storm of a great era, just like Roger!

...

Ten years later, the Marineford War.

When the Sharingan's gaze fell upon Marineford...

Allen spoke softly.

"The winners don't care what the world is like, they care about how they make it..."

"And I am the victor!"

"Schrödinger's heroine," "decisive and ruthless," "ruthless and vicious," "arrogant? What kind of young person isn't arrogant?!"

It's time to show the world a fighting style that's no longer suited to this era!

Luo Lan traveled through the pirate world, becoming captain of the Whitebeard Pirates' Squad Zero and activating a god-level manga system. He knew full well the fate of the Whitebeard Pirates at Marineford. So, he retreated to gain experience and improve his own strength. With the Battle of Marineford imminent, Whitebeard needed a period of intensive treatment due to health issues, so he temporarily appointed Luo Lan as acting captain of the Whitebeard Pirates. Months later, when Whitebeard completed his treatment, he was utterly stunned! Marco: "The Undying Flame is the true way to activate the Phoenix Flame!" Jozu: "Eighth Death Gate, open! Who can withstand my [Night Jozu] move?" Vista: "When I master the dual-sword style, my Zanpakutō, Nosei, that's when you prepare your final words!" Little Oz: "The super-multiplication technique in Butterfly Transformation Mode is so fascinating!" ... Whitebeard: "I asked you to temporarily take charge of our group, and you've actually raised the captains' strength to that of a general?!!"

Kyle's third time traveling through time brings him to a world far more bizarre and dangerous than those of One Piece and Naruto. The painful experiences of his first two journeys, where he died in swords and kunai upon inheriting his memories, taught him this: if you're not strong enough, you die! Awakening his Nen ability at the age of seven, he possesses the power to turn everything around—the Book of the Unique World Resonance! When Gon needs strength to challenge Hisoka, Kyle extends an invitation: "Sign a contract. I'll grant you the opportunity to train in another world, and you'll grant me the power to reflect back." Thus, the Hunter world's strongest pirate group sets sail, and an organization more powerful than the Akatsuki in the Ninja World is born. But Kyle harbors a deepest secret: does this seemingly fair contract reflect the fruits of training, or does it reflect the fate of the contracted... themselves? As the bonds of the powerful from three worlds intertwine, what awaits them is the path to the highest...

Marinford...

"Gulala, Ace, are you okay?" Whitebeard stood at the bow of the Moby Dick and looked at the execution platform.

"Whitebeard! You've come as expected, and this time you're destined to never come back!" Zhan Guo shouted at Whitebeard.

"Oh? Going but never coming back? I'm afraid that's not up to you." A blond boy moved and appeared beside Whitebeard.

"Who are you?" Zhan Guo looked at Leiduo in confusion.

"Edward Reardo!" The young man waved his staff, creating a strange phenomenon in the sky and on earth.

"Gulalalala, let's have a big fight today, brothers!" Whitebeard activated the Tremor-Tremor Fruit, causing a huge tsunami.

……

The boy died, the girl lived.

When I opened my eyes again, I was not in a white hospital room, but in a cold, dark space.

There is no sun here, no earth, only deathly silence.

He also noticed something was wrong with her; she seemed to have been reborn, and not only did she resemble Hoshimiya Rokuro from the anime Date A Live, which he had watched before, but she also possessed magical spirit powers.

At the same time, she discovered that he was dead, his body beside her. Although she could not sense any signs of life, she felt as if she were still connected to him...

Suddenly, hope filled the girl's heart, and she decided to seek the realm between life and death, embarking on an unknown and long journey.

Her first stop was actually—

One Piece, Akame ga Kill!, Naruto, Re:Zero -Starting Life in Another World-, Overlord, Godslayer, Jackie Chan Adventures (in progress)

P.S.: The good news is that the author doesn't know how to write romance; the bad news is that the author only learned how to write exciting battle scenes.