Big Brother Kaido, the BattleGreymon of the Grand Line

After transmigrating into the world of One Piece, Rey eats the Dinosaur-Dinosaur Fruit, Model: Tyrannosaurus, said to be the strongest Ancient Zoan.

But Rey isn't impressed.

He changes the direction of his training and unlocks more forms.

Second Gear: Greymon!

Third Gear: MetalGreymon!

Fourth Gear: WarGreymon!

As the golden-armored, dragonlike Digimon rampages across the Grand Line, and the Dragon Busters arrive in Wano...

Even Kaido, the world's strongest creature, can only bow in submission!

Garp: "My iron fist can't even break through Rey's defense?"

Whitebeard: "Rey's Gaia Force is without a doubt the most terrifying attack in the world!"

Kaido: "Rey is the man I admire most. But... I treated him like a big brother, so why did he run off with my daughter?"

Yamato: "Okuchi-no-Makami? No way! I want to be MetalGarurumon and fuse with Uncle Rey to become Omnimon!"

This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.