Plot: Kamen Rider OOO Allstars: The 21 Leading Actors and Core Medals (ネット版 仮面ライダーオーズ　ALLSTARS　21の主役とコアメダル, Nettoban Kamen Raidā Ōzu Ōrusutāzu: Nijū-ichi no Shuyaku to Koa Medaru) is a series of net movies that were released by Toei to promote the Kamen Rider OOO summer movie, Kamen Rider OOO Wonderful: The Shogun and the 21 Core Medals.