The Release Event set for OP-15 contains only the 75 common and uncommon cards from the full OP-15 Adventure on Kami's Island set. Every card has a Release stamp but features the same art as the main release.
Each Release Event pack contains two random cards. Every participant in the OP-15 Release Event was given one pack. The packs were available from March 27, 2026 with the main set releasing on April 3, 2026.