My Admiral Was Exposed on Live Broadcast by My Sister

The protagonist travels to the world of One Piece, goes through all kinds of hardships, apprentices with Garp, learns swordsmanship, takes Thunder Fruit, bullies the three Ace brothers, defeats Big Mom, beats up Kaido, drinks with Whitebeard, and hooks up with red hair, and finally becomes an admiral. However, a sudden change suddenly brings the protagonist back to Blue Star. Let's see the admiral wandering around the city