One Piece just hit 600 million copies, and Eiichiro Oda celebrated in the wildest way possible

One Piece is one of the most popular entertainment franchises in the world, and that’s not just because of its merch, anime, and live action adaptations, but also of the record-breaking manga itself — which has now officially surpassed 600 million copies in circulation. To commemorate the milestone, creator Eiichiro Oda revealed that he wrote down the true secret of the One Piece, the legendary treasure sought by Monkey D. Luffy and pirates everywhere, which has been sealed inside a small treasure chest and sunk into the ocean until the day the series ends.