Ikki Yakou

Ikki Yakō is a oneshot manga by Eiichiro Oda, originally published in the 1994 Shonen Jump Spring Special. It won first place in the year's Hop☆Step manga awards.

It was later reprinted in 1998 as part of Wanted!, a compilation of Oda's pre-One Piece stories.

(Source: One Piece Wiki)