OP-01 "Romance Dawn" is the inaugural main set of Bandai's One Piece Card Game, launched in Japan on 25 July 2022. The "blue-bottom" variant refers to the 1st-print JP booster boxes, distinguishable by the blue underside of the box. Bandai later reprinted the set with a black bottom to correct printing errata on certain cards β making sealed blue-bottom boxes the collectible pre-errata run.
Pre-errata boxes command a significant premium because: supply is capped (no reprints of the original), demand has grown with the game's global expansion, and grading-worthy rare cards inside (e.g., Roger Alt, Luffy Parallel) trade at multi-thousand-dollar levels individually.