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)

A collection of short stories drawn by Oda Eiichiro before One Piece became a major hit. 
Includes: 
Wanted! (1992) 
God's Gift for the Future (1993) 
Ikki Yakou (1993) 
Monsters (1994) 
Romance Dawn (Version 2, 1996) 
To celebrate the 20th anniversary of the One Piece TV anime, Romance Dawn version 2 was adapted into a TV special. (Episode 907)

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