KATANA, One Piece Wiki

For the type of sword, see Katana. KATANA is a song performed by Roronoa Zoro for the One Piece Nippon Judan! 47 Cruise CD. Like the other songs in the album, it references a location in Japan, this location being the Fukushima Prefecture.

Katana - Wikipedia

Uzuki Tempura, One Piece Wiki

Sword, One Piece Wiki

Roronoa Zoro/Abilities and Powers, One Piece Wiki

Four Sword Style, One Piece Wiki

Japanese sword - Wikipedia

Kitetsu, One Piece Wiki

Katana - Wikipedia

Nagasone Kotetsu - Wikipedia

Three Sword Style/Two Sword Style, One Piece Wiki

One Piece: All of Zoro's Named Katanas Explained