One Piece: Dawn in the Darkness

What if CP9's deadliest assassin was Luffy's fourth brother? From the moment they became family, Rob Lucci swore an oath: protect Luffy at all costs and watch him claim the Pirate King's throne. Even Ace and Sabo admit this guy's brother complex puts theirs to shame. ASL? Try ASLL. When a cold-blooded government agent becomes the Straw Hat's secret guardian, the entire world of pirates and marines will never be the same. Brotherhood, betrayal, and destiny collide in this alternate One Piece saga.