Two Sword & Shield-era Japanese sets, six weeks apart on the release calendar, and a near-double gap in what they cost to buy sealed today.
S9 Star Birth and S9a Battle Region are often shelved together because of how close their release dates sit, but they are built very differently — one is nearly 40% bigger by card count, and the two currently list almost ¥10,000 apart. If you’re deciding which Japanese booster box to buy first, or trying to work out which set your loose packs came from, this guide lays out the verified numbers side by side.
Both sets sit inside the same short window of the Sword & Shield era, and the “S9” label on its own can be ambiguous — some listings shorten S9a to “S9” as well, which is exactly the kind of mix-up that leads to a buyer expecting one chase card and receiving a box for the other. Below, we break down each set’s card count, release date, headline chase card and current listed price, so you can confirm which box you’re actually looking at before you buy.
S9 Star Birth runs 127 cards and is currently listed at ¥21,500, headlined by Arceus VSTAR (S9 #120). S9a Battle Region runs 93 cards at ¥11,800, headlined by Hisuian Decidueye VSTAR (S9a #86). S9 currently lists at roughly 1.8x S9a’s price.
Prices are our own currently-listed Japanese booster box prices as of September 2026, converted at ¥159/USD where noted.
Two Sword & Shield-Era Sets, Six Weeks Apart
S9 Star Birth released in Japan on January 14, 2022 with a 127-card set list. S9a Battle Region followed on February 25, 2022 — about six weeks later — with a smaller 93-card list. Both sit in the same Sword & Shield-era release window, which is why they’re frequently mentioned together, but they were built as separate products with different card counts and different chase cards.
On the English side, our own set-mapping hub pairs S9 with S8b under the Brilliant Stars release — see our Brilliant Stars Japanese card list for that specific mapping. S9a’s own English-side content is tracked separately in our Astral Radiance Japanese card list alongside S10D and S10P. The two Japanese sets don’t map to a single shared English release, so treat S9 and S9a as related neighbours rather than a matched pair.
The practical takeaway from the release dates alone: S9 had a roughly six-week head start on shelves before S9a arrived, and by card count it’s the larger of the two products. Neither of those facts tells you anything about how easy either chase card is to open — they’re simply how the two sets were structured at launch.
S9 Star Birth in Detail
S9 Star Birth is the larger of the two releases at 127 cards. Its headline chase card is Arceus VSTAR, card S9 #120, a Holo Rare print of the Colorless-type card with 280 HP.
S9 Star Birth is currently listed at ¥21,500 per booster box. For the full 127-card breakdown, see our Star Birth S9 card list and our dedicated S9 Star Birth best-cards guide.
S9a Battle Region in Detail
S9a Battle Region is the smaller, follow-up release at 93 cards. Its headline chase card is Hisuian Decidueye VSTAR (JP: ヒスイ ジュナイパーVSTAR), card S9a #86, a Holo Rare print of the Fighting-type card with 270 HP.
S9a Battle Region is currently listed at ¥11,800 per booster box — a little over half of S9’s price. For the full 93-card breakdown, see our Battle Region S9a card list and our dedicated S9a Battle Region best-cards guide.
What’s Actually in Each Box
The 34-card gap between S9 (127) and S9a (93) is a real structural difference — S9 is roughly 37% bigger by total card count. That’s a fact about how the sets were built, not a statement about how easy either chase card is to pull; we don’t have verified pull-rate data for either set, so we’re not going to guess at one here.
The Hisuian Zoroark VSTAR shown above is from the later S10a Dark Phantasma set, not S9a — it’s included here for a side-by-side look at the same “Hisuian VSTAR” card family that S9a’s Hisuian Decidueye VSTAR belongs to. The low-numbered common on the right is a reminder of what most of a box actually contains: 127 or 93 cards apiece, and the vast majority of them are commons and uncommons, not the VSTAR chase print on the cover of every listing.
This is worth repeating because it’s easy to compare two booster boxes purely on their chase card and lose sight of the rest of the set list. A box of S9 Star Birth is built around a 127-card checklist; a box of S9a Battle Region around a 93-card checklist. Both include their own full run of commons, uncommons and rares beyond the single VSTAR print most listings lead with.
Price Comparison: S9 vs S9a
| Set | Set code | Cards | Released | Current price |
|---|---|---|---|---|
| Star Birth | S9 | 127 | Jan 14, 2022 | ¥21,500 |
| Battle Region | S9a | 93 | Feb 25, 2022 | ¥11,800 |
S9 currently lists at roughly 1.8x the price of S9a. That gap tracks the card-count difference loosely but isn’t explained by it alone — it’s simply where each box is priced in our own catalogue today, and pricing on both can move over time.
Which Should You Buy
There’s no universal right answer here — it comes down to which chase card and which price point fits what you’re after. Since S9 and S9a don’t share a chase card and don’t map to one shared English set, picking between them is really a question of which specific card and which specific budget matters more to you:
- Chasing Arceus VSTAR (S9 #120) — go with S9 Star Birth. It’s the larger set and the only one of the two that carries this specific print.
- Chasing Hisuian Decidueye VSTAR (S9a #86) — go with S9a Battle Region. It’s the lower-priced box of the pair and the only source for this print.
- Working to a smaller budget — S9a Battle Region at ¥11,800 is the more accessible entry point of the two.
- Building out a complete Sword & Shield-era run — both boxes are separate, non-overlapping card pools, so there’s no redundancy in picking up either or both.
Both sets are commonly shortened to “S9,” so double-check whether a listing says S9 or S9a before buying — the two boxes are priced almost ¥10,000 apart.
Where to Buy S9 and S9a from Japan
We ship both S9 Star Birth and S9a Battle Region sealed booster boxes worldwide from Tokyo with tracked delivery. Whichever chase card you’re after — Arceus VSTAR from S9, or Hisuian Decidueye VSTAR from S9a — the booster box is the way to open your own copy from a full, unsearched Japanese set list rather than buying the single card separately.
- S9 Star Birth Japanese Booster Box — currently listed at ¥21,500
- S9a Battle Region Japanese Booster Box — currently listed at ¥11,800
For singles from either set, or to build a mixed order across other Japanese Pokemon sets, our Quick Order page is the fastest way to check current availability.
자주 묻는 질문
Which is more expensive, S9 Star Birth or S9a Battle Region?
S9 Star Birth is currently listed at ¥21,500, roughly 1.8x the price of S9a Battle Region at ¥11,800.
How many cards are in S9 Star Birth?
S9 Star Birth has 127 cards. It released in Japan on January 14, 2022.
How many cards are in S9a Battle Region?
S9a Battle Region has 93 cards. It released in Japan on February 25, 2022, about six weeks after S9.
What is the chase card in each set?
S9 Star Birth’s chase card is Arceus VSTAR (S9 #120), a Holo Rare Colorless-type card with 280 HP. S9a Battle Region’s chase card is Hisuian Decidueye VSTAR (S9a #86), a Holo Rare Fighting-type card with 270 HP.
Are S9 and S9a part of the same English set?
Not directly. Our set-mapping hub pairs S9 with S8b under the English Brilliant Stars release, while S9a’s content is tracked alongside S10D and S10P under Astral Radiance. S9 and S9a don’t map to one shared English set.
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