Union Arena: That Time I Got Reincarnated As A Slime Booster Box (UE20BT) (Presale - Expected Release Date June 26th, 2026)

PRESALE - Expected release date June 26th, 2026.

This item is subject to our Pre Order policy. It is available under "Our Pre-Order Policy" in this link.

Release dates are provided by the manufacturer and are subject to change. Products may arrive earlier or later than the estimated release window. Orders containing pre-release items will ship once all items are in stock.

❶ That Time I Got Reincarnated as a Slime joins the fray at last! Introducing UNION ARENA’s first large-scale Special Booster! 
The hit anime That Time I Got Reincarnated as a Slime joins UNION ARENA, arriving as the first Special Booster Pack for the English release. In Japan the content was split into Vol.1 and Vol.2, but the English edition brings them together in one large product. With nearly 200 card types featuring popular characters from Seasons 1 to 3, including Rimuru, Milim, Shizue, Shion, Benimaru, and Shuna, this is a dream item that lets players start building a variety of decks right away.

❷ Features a wide selection of stunning newly drawn illustrations, with multiple premium finishes to look out for.
There are 13 card types with brand-new illustrations made especially for UNION ARENA! Packed with irresistible content for fans, it features a wide variety of alt-art cards of must-have characters. Each card also comes with its own unique finish, giving every pack a truly special feel.

❸ Includes North America exclusive foil-stamped autograph cards and other newly designed cards!
Features a wide range of North America exclusive foil-stamped autograph cards and newly designed cards. Alongside charming newly illustrated artwork, all ★★★ and ★★ cards include foil-stamped autographs, offering a truly luxurious finish that collectors will find irresistible. In addition, numerous new designs exclusive to North America are also included. Please look forward to discovering what they look like.

❹ North America Exclusive! Autograph AP cards can be found!
A limited number of North America exclusive serial-number Action Point cards are included at an extremely rare pull rate. In addition, North America exclusive handwritten autograph AP card versions are also available, making these serial number AP cards highly collectible!


RARITIES
• Common: 67
• Uncommon: 61
• Rare: 38
• Super Rare: 22
• Action Point Card: 13
188 card + 13AP Card Types
*Also includes alternate art and/or design cards from the above types.

CONFIGURATION
♦ 12 cards per pack
♦ 16 packs per display
♦ 16 displays per case