The One Piece Card Game: The Azure Sea's Seven [OP14-EB04] booster box is an Extra Booster set themed around the Seven Warlords of the Sea, featuring 24 packs per box. This release focuses on new and classic Warlords like Doflamingo, Crocodile, and Mihawk, with 157+1 card types. It features new leader, super rare, and alternate art cards. 
Key Features & Description:
Theme: The Seven Warlords of the Sea (including Crocodile, Doflamingo, Mihawk, Boa Hancock).
Set Composition: Contains cards from both OP-14 and EB-04, emphasizing new leader cards, powerful characters, and new DON!! cards.
Contents: Each box typically contains 24 booster packs, with 6 cards per pack.
Rarity Breakdown: Includes Leaders, Commons, Uncommons, Rares, Super Rares, Secret Rares, Special Cards, Treasure Rares, and DON!! cards.
Gameplay Focus: Introduces new mechanics, such as Trafalgar Law's swap power and strong control options for characters like Gecko Moria and Crocodile.
Availability: Released in early 2026, with some versions featuring Japanese text and others in English. 
The set is highly anticipated for strengthening decks with new, "interesting" leader cards and powerful, popular characters.