Hiroyuki Nakano And Yuji Iwasaki From Weekly Shonen Jump Talk About ‘One Piece’ As It Reaches Its 100th Volume What with the 'One Piece' manga celebrating its 100th volume, I caught up with Weekly Shonen Jump’s editor-in-chief Hiroyuki Nakano and 'One Piece’s' editor Yuji Iwasaki to find out why this manga continues to endure.