Three Hundred Bankai at a Whim: I Became the Celestial Dragons' Worst Nightmare

Also known as Taking Over the Grand Line by Making Three Hundred Zanpakuto from the Start and The Grand Line's God-Tier Item Master.

He transmigrates into the world of One Piece as a disabled orphan in Ohara!

Worst of all, the Buster Call is about to arrive, and Ohara is going to be wiped out. Fortunately, he awakens the miraculous Crafting Master System and gets a Zanpakuto template from the start. He forges three hundred Zanpakuto, and then...

Akainu: "Good grief! The magma I use to burn things is being burned!"

Aokiji: "You might not believe this, but someone actually froze me!"

Kizaru: "Who's got it worse than me? I got kicked in the face by light!"

After the Buster Call fails, the once-sacred land of archaeology gradually becomes an invincible empire on the sea.

Some call it the "Empire of Black Technology!"

Some call it the "Technological Holy Land a Thousand Years Ahead of Its Time!"

Some call it the "Graveyard of the Strong, and the Cradle of the Stronger!"

Some call it...

Roger: "I prefer to call it a resort beyond dimensions!"

.

This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.