VIZ Media announced at the company’s Weekly Shonen Jump panel at Japan Expo 2013 that it will be publishing the Strong World one shot for Eiichiro Oda’s One Piece manga.

The one shot is described as:

Find out what the world of One Piece looked like 20 years ago in this bonus chapter. Gold Roger, White Beard and a ton of other legends battle it out in a time before Luffy was even born.

The one shot will premiere in the digital anthology’s next issue, which will be released on September 2, 2013.

Source: ANN