Ryu Nakuma is a young boy who recently became a pirate and formed a crew named the Crisome Flame Pirates At a young age he was trained by a martial arts master along with other students in a dojo his older sister was commonly his sort of encouragement she was the strongest student in the dojo and could even defeat fully grown adults with ease he has always wants to sail the seas to repay the man who killed his father when he was just an infant but his sister hated pirates in all there glory but she was old enough at the time to remember what happened and to remember how grusommly the pirates killed there father she went on to become a marine vice admiral leaving Ryu a few years before he begins his journey which only fed his desire to become a pirate