One Piece: On Your Side, Volume 109 (by Eiichiro Oda)

Join Monkey D. Luffy and his swashbuckling crew in their search for the ultimate treasure, One Piece!As a child, Monkey D. Luffy dreamed of becoming King of the Pirates. But his life changed when he accidentally gained the power to stretch like rubber.at the cost of never being able to swim again! Years later, Luffy sets off in search of the One Piece, said to be the greatest treasure in the world.As Bonney learns the truth of what happened to her father and who was responsible, she burns with the fires of vengeance. But she'll need the help of Luffy and others if she wants to get the justice she deserves. Meanwhile, Dr. Vegapunk threatens to reveal the hidden history of the world!