Union Arena Uma Musume booster lands December 11 at 385 yen a pack
Bandai's Uma Musume: Pretty Derby Booster Pack has 8 cards per pack, foil-stamped cast signatures for 22 characters, and a serial-numbered limited AP campaign.
Bandai's Union Arena will release the Uma Musume: Pretty Derby Booster Pack on Friday December 11, 2026, at a suggested retail price of 385 yen per pack, tax included. The set brings the Uma Musume: Pretty Derby franchise into the game as a booster product.
Pack and box format
Each pack holds 8 cards, and each box holds 16 packs. Cards are inserted at random, and the product includes parallel cards.
The card count by rarity is 12 types of SR (Super Rare), 18 of R (Rare), 35 of U (Uncommon), 35 of C (Common), and 13 of AP (Action Point).
Which cards are parallels, how many there are, and at what rates they appear have not been announced yet.
Foil-stamped signatures and new illustrations
A key feature is card designs with foil-stamped replica signatures of the cast members who voice the characters. The lineup covers 22 characters: Special Week (Azumi Waki), Silence Suzuka (Marika Kohno), Tokai Teio (Machico), Oguri Cap (Chiha Takayanagi), Gold Ship (Hitomi Ueda), Vodka (Ayaka Ohashi), Daiwa Scarlet (Chisa Kimura), Grass Wonder (Rena Maeda), Mejiro McQueen (Saori Onishi), El Condor Pasa (Minami Takahashi), Narita Brian (Rika Kinugawa), and Symboli Rudolf (Azusa Tadokoro).
The rest of the lineup is Air Groove (Ruriko Aoki), Seiun Sky (Akari Kito), Tamamo Cross (Naomi Ozora), Mihono Bourbon (Ikumi Hasegawa), Rice Shower (Manaka Iwami), Agnes Tachyon (Sumire Uesaka), Super Creek (Kana Yuki), Haru Urara (Shina Shuto), King Halo (Iori Saeki), and Tanino Gimlet (Misato Matsuoka).
The pack also carries newly drawn illustration cards that show the characters in special Union Arena outfits, with many new illustrations by multiple illustrators. Twelve characters get the special-outfit treatment: Special Week, Silence Suzuka, Tokai Teio, Oguri Cap, Gold Ship, Vodka, Daiwa Scarlet, Mejiro McQueen, Symboli Rudolf, Mihono Bourbon, Rice Shower, and Haru Urara.
The serial-numbered limited AP campaign
The chase element is a "serial-numbered limited AP" card campaign. Limited Action Point cards bearing serial numbers are inserted into booster packs at an extremely low rate and in limited quantity. The cards are planned to carry the handwritten autographs of the appearing cast members.
Several conditions apply. Whether these cards will be inserted into reprint runs is undecided. They cannot be exchanged or returned for appearance defects and similar issues. Further details of the campaign will be updated at a later date.
Why it matters and how it fits the calendar
The booster is one half of a two-product Uma Musume launch on December 11, 2026. The franchise's Starter Deck ships the same day for 1,650 yen, with a 50-card deck, 3 AP cards, a play sheet, and a Promotion R pack.
The price also matches another recent booster in the game. The second Monogatari booster pack, due November 27, 2026, is likewise priced at 385 yen per pack. It arrives two weeks ahead of the Uma Musume set.
The franchise will also have a presence at events: BANDAI CARD GAMES Fest 26-27 in TOKYO, set for February 20–21, 2027, includes an Umamusume: Pretty Derby attendance card.
What is still unknown
Release information for other regions is not announced yet. The exact insertion rate and total quantity of the serial-numbered limited AP cards have not been announced either, and the reprint question remains open. Product specifications may change, and photos may differ slightly from the actual product.
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