One Piece OP17: The World’s Strongest Warriors Explained
The 4th anniversary One Piece set, explained: release dates, English vs Japanese boxes and whether The World's Strongest Warriors is worth opening.
5 min read
One Piece guide
Four years of the One Piece Card Game, and Bandai marked it with a set called The World’s Strongest Warriors. You’ll see it listed as One Piece OP17 (or OP-17), and it’s easy to spot on the shelf: Luffy in a horned helmet, with a gold 4th Anniversary logo on the box.
It’s one of the most asked-about sets in our shop this year, so here’s a proper rundown of what it is, when it came out, how the English and Japanese boxes differ and whether it’s worth opening.
The English booster box, with Luffy and the 4th Anniversary logo.
In this guide
What is One Piece OP17?
The World’s Strongest Warriors is the seventeenth main booster set for the One Piece Card Game and the official 4th anniversary set. The game itself launched in Japan in July 2022, so this release is a bit of a milestone for anyone who’s been playing since the start.
The set has 131 cards plus 4 extras. You’ll find Leaders, commons, uncommons, rares, super rares, secret rares, special cards, DON!! cards and a Treasure Rare. In other words, there’s a lot to chase if you’re a collector, and plenty of new options if you play.
A quick refresher on how the game works
If you’re new, each player picks a Leader card and builds a 50-card deck around its colour. You use DON!! cards to pay for Characters, Events and attacks, and the aim is to knock out your opponent’s Life cards. It’s quick to learn, which is a big part of why the game has grown so fast in the UK.
One Piece OP17 release date
Japan got it first, on 22 August 2026. The English version followed with a pre-release on 21 August 2026 and a full release on 28 August 2026, which is a much shorter gap than older sets used to have.
This is the question we get most about One Piece OP17, so here’s the simple version.
Japanese box
OP-18 (pre-order)
OP-16 sealed case
English booster box
The English booster box has 24 packs with 12 cards in each, so 288 cards in total. It’s the one to get if you play at UK events, since English cards are what you’ll use in official tournaments here.
Japanese booster box
The Japanese booster box also has 24 packs, but with 6 cards per pack. Collectors love Japanese boxes for the print quality and the value, and the artwork is the same. If you’re collecting rather than playing, it’s a great option.
Is it worth opening?
For us, One Piece OP17 is worth it, especially for collectors. Anniversary sets tend to get a bit more love in the design department, and the Treasure Rare gives every box a genuine chase. Players will want to look through the new Leaders before deciding, but there’s plenty here to build around.
One thing worth knowing: sealed anniversary boxes often hold their interest well after release. If you’re thinking of keeping one sealed, it’s usually easier to pick it up while stock is still easy to find.
What comes next
The next English set, The Dominance of God (OP-18), lands in November 2026. You can pre-order the OP-18 booster box now, and it also carries the 4th Anniversary logo.
Building a deck from your pulls
If you’re opening One Piece OP17 to play, don’t try to build a deck from a single box straight away. Lay your Leaders out first and look at which colours you pulled the most cards for. That usually tells you where to start.
From there, it’s normal to pick up a starter deck in the same colour to fill the gaps. Most players also end up buying a few singles for the cards they need in fours. It’s not cheating, it’s just how the game works once you get past casual games at home.
And if you’re not sure which Leader suits you, try two or three in casual games before you commit. You’ll know pretty quickly which one feels right.
Where it fits in the One Piece timeline
One Piece OP17 sits between OP-16 and OP-18, and it’s the set that kicked off the anniversary celebrations. If you collect by set number, it’s a natural point to fill gaps from earlier releases too. Older Japanese boxes like the OP-16 sealed case are still around, but they don’t stay in stock forever.
We’d also say this: you don’t need every set. Pick the ones with the characters and art you love, and your collection will mean a lot more to you than a shelf of boxes you bought because you felt you had to.
Tips for opening One Piece OP17
Sort by Leader colour as you go. It makes deck-building much quicker afterwards.
Sleeve anything shiny straight away. Secret rares and the Treasure Rare deserve a sleeve and a top loader.
Keep your DON!! cards. Alternate DON!! art is collectable in its own right.
Open with friends. Honestly, it’s more fun, and you can trade duplicates on the spot.
Frequently asked questions
How many cards are in the set?
One Piece OP17 has 131 cards plus 4 extras, including a Treasure Rare.
How many packs are in a booster box?
Both the English and Japanese boxes have 24 packs. English packs have 12 cards and Japanese packs have 6.
Is it a good set for beginners?
Yes. Pair a booster box with a starter deck and you’ll have plenty to build a first deck.
