Strongest One Piece System

A 20 years old man in modern day Earth was struck by lightning while he was on his way home. His body disintegrated and the next thing he knew, he was in a completely different world. "What?! You can use fire spells? Then let me show you the power of the Flame Flame fruit" "Your sword is one of the legendary weapons? Then let me show you my 'Yoru' that can cleave even the heavens itself!" "The enemy is an expert of body strengthening? Hehehe, I will show you how fearsome my Haki is!" Follow as he travel the unknown world filled with dangers where the strong ruled and being weak is a sin.