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!"

Chapter 160 - Chapter 160 (Skip this)