One Piece: The Learning System That Multiplies Your Gains from the Start

After transmigrating into the world of the Pirate King, someone who had never watched Pirate King became Portgas D. Yuze and was adopted by Dragon, the leader of the Revolutionary Army.

He also awakened the Billionfold Learning System, and from then on began a very different life.

Dragon casually explained the Three Types of Haki, and Yuze instantly mastered them.

Little Ivankov casually tossed Yuze an encyclopedia of Devil Fruits, and Yuze began mass-producing Devil Fruits.

Garp casually mentioned how to forge a sword, and the Great Grade Sword became a worthless weapon.

But everyone in the Revolutionary Army kept the fact that Yuze was a genius from him, making him believe all along that he was a nobody.

Until one day, everyone in the Revolutionary Army said to Yuze, "We're done pretending. You're actually an unparalleled genius."