One Piece: I, Robin's Younger Brother, Became a Saiyan

The Saiyan who was sent to the pirate world was accidentally adopted by the escaped Robin and named Lu Bai. Danger ensues. Pirate hunters, navy, and pirates are all eyeing Robin's huge piece of fat. From then on, the two siblings embarked on the road to escape. As Lu Bai grew up, Robin discovered that his younger brother was different. "Lu Bai, can you kill a person with just one punch?" "I didn't try hard." "Lu Bai, who is this boy named Sauron?" "My third brother, Zoro, is not called eldest sister yet." "Who is this little beauty with two horns?" "Her name is Yamato. She clamored to be my wife. She chased me for three years, but I didn't agree." "Lu Bai, who are you?" "I'm Robin's brother!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.