The longest (still) running anime after Detective Conan, One Piece takes its viewers on the ultimate adventure where they explore uncharted waters and meet new personalities. It has a Whole Arc related to Samurai -Wano Arc. One Piece also has notable characters such as Roronoa Zoro, Dracule Mihawk, Shanks, Rayleigh, Trafalgar Law, Kozuki Oden, Kine'mon, and various other characters who wield Swords as their weapon of choice. Some of the swords appear to be made out of black metal, such as Shusui, Yoru.