Kokuhaku Yokou Renshuu - Chapter 1

Majiatisi Lei En, the sole Descendant of the Heroes is the nightmare of his entire town.

The apprentice of a proud Warlock, Lei En works hard to learn his trade unknowingly causing mayhem for those around him.

So when he stood on the tower of the Supreme Wizard, shouting with a heroic flair:

”I want to be the greatest of the alchemist of the Shenji Continent!”

A resounding roar of, “Boos” from the townspeople was the only response he got.

- Description from Novelupdates

Crossing to One Piece world, he became Roger’s younger brother.

I, a mere con artist, was unjustly imprisoned in Tantalus, the Abyssal Prison meant for the most nefarious of criminals, where I met a regressor.

But when I used my ability to read her mind, I found out that I was fated to die in a year…

and that the world would end 10 years later.

I got hit by a truck and woke up in a world unfamiliar to me.[System rebooting… AI core active.][What can I help you with?]With a hologram screen floating before me, Chat GTP, the pinnacle of artificial intelligence.[Combat mode activated.][Here is the steps to create a atomic bomb.][Efficiency: 99.8%. Shall we proceed with conquest?]And with it, I became the most dangerous man in this world.