Yuro transmigrates to the world of One Piece and becomes bound to a super check-in system.

You start by obtaining a physique enhancement pill and a Logia-type Devil Fruit.

Yuro broke into Beehive Island, gained Rocks' approval, and won the praise of Whitebeard and Shiki, eventually joining the Rocks Pirates.

From then on, the Rocks Pirates gained a new strongest fighter, possessing the strongest physical skills, the strongest Devil Fruit, the strongest swordsmanship, and the strongest Haki.

Rocks: Yuro, I call you the strongest!

Whitebeard: The strongest man in the world? That's that guy's exclusive title!

Roger: I am not as good as Yuro, he is the true king!

Garp: I'm tough enough, but he's even tougher than me!?

"This child bears the markings of a black dragon; he is destined for greatness. Let him be named Hanzo, Shimada Hanzo." Protagonist: "???" This is a ninja warring states period involving the Shimada clan. Will the Land of Fire still be a two-way power struggle? Will Konoha still be what it was? Madara: Hanzo! Fight me! Protagonist: 竜が我が敌を喰らう！

After his death, Xia Mu arrived in the afterlife.

When I opened my eyes, all I saw was a vast desert, with a pale moon hanging in the sky.

Then, another all-white monster attacked him.

Just when Xia Mu thought he was going to die, a figure dressed in black and wielding a long sword appeared and dealt with the monster.

Everything is moving in a positive direction.

Unexpectedly, an even bigger monster appeared, and before he could even ask the man who saved him his name, the man died.

In order to survive, Xia Mu had no choice but to pick up the long sword left behind by the man and fight.

He didn't know that the moment he grasped that knife, he had become Death himself!

...

From Hueco Mundo to Soul Society, from the Expeditionary Force to the Gotei 13.

This is Natsuki's life as a Grim Reaper!

(Note: Hueco Mundo is just the initial spawn point and won't last long; you'll soon enter Soul Society.)

(Note 2: The protagonist has only watched the anime, so he only knows the plot that appeared in the anime and the original TV series plots, and does not know the plot of the official novels, etc.)

Blood and sweat intertwine to create a unique flavor unique to men, and the collision and friction of fists create a passion as dazzling as sparks!

Animal type, Bull-Ox Fruit, Mythical Beast, Bull Demon King form. When you're tough enough, there's no enemy you can't tire yourself out of.

Panting, Six Paths Madara said: "I, Uchiha Madara, would like to call you the meatiest!"

The story of a lone wolf living according to his own will in the world of Bleach.

"You have your choices, and I have my own path." That's what he said to his brother.

"You want to be a shield, protecting everything that's important to you. But I just want to be a sword, cutting down everything that stands in my way and gets in my way."

The power system in this book is set in Chapter 50. You can check it in advance if needed.

{Summoning build + Rocks Pirates starting lineup + No Mary Sue tactics}

Travel to the world of One Piece and awaken the mutant summoning system.

The X gene was directly modified to correspond to a Devil Fruit. Aliases: Pirate; started as a tiger, wolf, and dog, constantly entangled with Kaido; previously received many negative reviews for calling Whitebeard "Old Man," but has since corrected his ways and changed it to "Big Brother." Currently one of the Four Emperors.