From the world of one piece to the strongest

Introduction: What should I do if I travel to the world of pirates but are weak and sick?Under the shelter of the old doctor, Fenrir deviated from the orthodox tradition. In order to improve his talent, he studied blood factors and devoted himself to the research of viruses and bacteria. He endured for several years under the hands of the great pirate Lockes, and finally changed his fate on the eve of the battle in the Valley of the Gods.