Hokage for All: Eating the Underworld Fruit by Mistake at the Start

National Hokage? Pirate invasion? What happened to this world? My name is Xu You. When I woke up, I discovered a terrible thing. I was reborn in a world with ninjas, navy and pirates. The person who traveled to the world of Naruto and came back was actually called a "brave". People who eat devil fruits are actually called [Devils]. Located at the [New Navy] headquarters, the marshal is actually instructor Zefa. What? ! Most of the earth was occupied by the Big Mom Pirates and the Beast Pirates and became colonies.