I Am Uchiha Madara, and I Aim to Become the Pirate King

The protagonist grows up in a happy family, but one day he gets into a car accident. When he wakes, he has become Uchiha Madara and entered the world of One Piece. The only way to return to his old life is to become the Pirate King. This book focuses more on battles between the strong, so there are quite a lot of fight scenes. The story alternates between first-person and third-person narration.