Adventure on Kami's Island Booster Box EV Calculator

Best Evidence — Japanese collation proxy

Evidence

This calculator is based on Best Evidence — Japanese collation proxy reviewed September 4, 2026.

Sources

• Adventure on Kami's Island [OP15-EB04] official English product page - Bandai Co., Ltd. (accessed 2026-09-03)
• TCGCSV category 68 group 24637, sealed product 682057 - TCGCSV (accessed 2026-09-03) — identity and pricing were imported into local generated artifacts; the calculator does not call the raw endpoint.
• Best Evidence — Japanese collation proxy and ordinary-pool classification - The Expected Value (accessed 2026-09-04)
• English OP15-EB04 combined card checklist - Bandai Co., Ltd. (accessed 2026-09-04)
• Japanese standalone OP15 six-card booster and roster - Bandai Co., Ltd. (accessed 2026-09-04)
• First-hand OP15 Japanese opening; Rare and below omitted - barney31 via r/OnePieceCardPulls (accessed 2026-09-04)
• DP-10 separate one-card DON!! bonus, two designs - Bandai Co., Ltd. (accessed 2026-09-04)

Limitations

• collation.cardsPerPack and collation.packsPerProduct: the product uses 12 cards per pack and 24 packs per English booster box; those physical wrapper counts do not establish rarity-slot probabilities.
• collation.caseStructure: box-level hit counts and display/case correlations are unresolved for the exact English North America printing.
• evidence.sample: null because no reviewed observation provides a complete, attributable sample with exact unit, size, method, North America printing, and observation interval.
• identifiers.tcgcsvGroupId: The English publisher product is the combined OP15-EB04 release. It must not be substituted with the Asian standalone OP15 product.
• Modeling policy approved 2026-09-04: every supported ordinary card in the same slot, rarity, treatment, and finish pool receives one equal positive selection weight. This is a transparent modeling assumption where the publisher or empirical sample gives pool odds but not card-level sheet weights.
• OP15-EB04 assumption-only box marginals: 166 Common, 72 Uncommon, 39 Rare, 4 Leader, 4 Super Rare, 1 regular Secret Rare, and 2 ordinary DON!! outcomes total 288 physical cards. No complete OP15-EB04 English or Japanese rarity ledger was established. The retained probabilities and Secret Rare conditioning are explicit generic assumptions, not measured pull rates or a factory guarantee.
• The exact English combined roster contains 149 ordinary identities: OP15-001 through OP15-119, EB04-001 through EB04-010, and EB04-042 through EB04-061. Its 60 Common, 30 Uncommon, 35 Rare, 7 Leader, 14 Super Rare and 3 Secret Rare identities use exact English treatment/finish SKUs with positive TCGplayer Low prices. EB04-011 through EB04-041 belong to the different OP14-EB04 release. Equal card weights within retained rarity pools are assumptions; the checklist does not establish the OP15/EB04 mixture or printing-sheet weights.
• The reviewed first-hand Japanese OP15 opening explicitly omits Rare and below; it supplies no complete rarity/DON!! ledger, pack sequence, printing wave or opening interval. Commenters' asserted standard hit rates are not adopted as measured data. The separate Japanese OP15 product and partial opening corroborate identity only; Japanese prices, the entire EB04 roster, and another set's observations do not establish this English box's probabilities or value.
• English ordinary booster DON!! Luffy product 686650 uses its exact Foil Low price. Gold DON!! 686651 is removed before drawing and the retained DON!! pool is normalized to the ordinary card. Two expected DON!! per box and replacement of Common positions are explicit assumptions. No reviewed source establishes a thirteenth card, so DON!! remains inside the 24 twelve-card boosters with no phantom cards or separate box-only DON!! bonus.
• Each synthetic twelve-card pack has seven Common-or-DON!! positions weighted 83/84 Common and 1/84 DON!!, three Uncommons, one guaranteed Rare, and one upgrade weighted 15/24 Rare, 4/24 Leader, 4/24 Super Rare and 1/24 regular Secret Rare. Slot assignment is an explicit modeling assumption. These independent draws preserve expected marginals, not guaranteed box counts, no-duplicate rules or case seeding. Embedded pack EV is box EV divided by 24, including 2/24 expected DON!!. Chase is removed and retained same-slot outcomes normalized before drawing; draw all 288 cards before Sift or user filters, which never backfill the draw.
• Exact Dash Pack SKUs 686291-686296, DP-10 bonus DON!! 689810/689811, and Regional Top 64 prize 710740 are external promotions, excluded from booster positions. No external purchase or tournament promotion adds default value to sealed box 682057. All unsupported alternate arts, Manga, Special, Treasure Rare and Gold DON!! identities are absent before drawing, including the Roronoa Zoro Treasure Rare 685335 whose title has no SP marker. Regular Secret Rares EB04-061 Monkey.D.Luffy 685333, OP15-118 Enel 685477, and OP15-119 Monkey.D.Luffy 685480 remain eligible; their alternate arts and Manga never occupy zero-EV positions.
• No-chase redraw policy approved 2026-09-04: Curio, Enchanted, alternate-art, parallel, showcase, serialized, signature, premium-rarity, promotional, and any other card or treatment without a supported pull rate are excluded. A chase hit is redrawn from the applicable supported ordinary pool, so excluded cards occupy no modeled outcome.
• Simulation ordering is draw the complete disclosed no-chase product first, record that draw, and only then apply Sift or another user filter. Sift never changes or backfills the completed modeled draw.