One Piece: Starting with Sharingan, I Joined the Straw Hat Pirates

Two barrels at the start? When Tatsuya woke up, he found himself squeezed into a barrel of wine, with the future Pirate King Luffy sleeping next to him. Bind to the [God-Level Naruto System] and receive the Sharingan as a starting reward! From then on, the Straw Hat Pirates had a vice-captain with a unique style. Marineford War? Facing Akainu's magma fist. Tatsuya sneered, and the complete Susanoo behind him rose from the ground: "Akainu, have you ever seen the Uchiha in their prime?" Light-speed kick? Facing Kizaru who can take down enemies with a single kick. Tatsuya's Sharingan flashed: "Flying Thunder God Technique, ever heard of it?" Take you back to a new age of sailing filled with passion and emotion! — Description from novelcodex.org