MC get Isekai'd as Luffy. At the age of 5, he was assigned to become a member of the Marine. But as Luffy grew up, Garp slowly began to regret his decision. Luffy: "What? Justice? Killing the damn Celestial Dragons is justice!" Luffy: "What? It's wrong for a marine to be king? " Luffy: "What? My three wives and four concubines affect the reputation of the Marine? What law prohibits marrying multiple wives?" Garp: "My dear grandson, stop making trouble. If you continue like this, our Monkey family will become Celestial Dragons!"
Best One Piece FF I read till now. There are close to no grammatical mistakes. I like the MC's personality and his relationship with Garp. Looking forward to seeing his interaction with Luffy. Hope he will go with Garp to visit him and Ace at least once.