One Piece: I Train Luffy and His Two Brothers into Admirals

After transmigrating to the world of One Piece, Kahn becomes an orphan adopted by the Dadan Family and awakens a [Concept-Level Body]!

He won’t eat a Devil Fruit or train in Haki.

He gets stronger just by breathing, and getting hit grants him absolute immunity and causes him to evolve in return!

So he can lie flat in peace someday, Kahn sets his sights on Ace, Sabo, and Luffy, who have just arrived, and puts them through hellish training.

He ties Luffy to a rocket to train his elasticity, and throws Ace into a volcano to train his heat resistance...

A few years later, Garp returns to the East Blue to check on their training results.

Looking at Ace, who can shatter a meteor with one punch; Sabo, who can tear apart a Pacifista with his bare hands; and Luffy, who has unlocked Muscle Gear Fifth and is beating up Sea Kings, Garp’s spirit completely collapses. “You call this survival training for little kids?!”

Then the Paramount War breaks out.

Facing three monster younger brothers with the fighting power of Admirals, Sengoku and the Three Admirals fall into deep despair.

Just as the Marines prepare to use the Ancient Weapon Uranus to perish together with their enemies, the sky splits open.

Kahn descends from above with a yawn, slaps Akainu’s magma out of existence, then splits Marineford in two with his other hand. He says helplessly:

“I just want to be a couch potato. Why do you have to bully my little brothers and force me to get involved?”

At that moment, the whole sea goes mad: Could it be that Luffy has an even more terrifying monster of an older brother above him?