As everyone assembles at Boodookan for the Grateful Rock Festival, Cyan grows concerned that she hasn't heard from Strawberry Heart since rescuing Chuchu, while Dagger prepares to use a song written by Grateful King to take over Midi City. Midway through the festival, Plasmagica, Shingancrimsonz, Tsurezurenaru, and Trichronika are attacked by a Dark Monster, capturing everyone except for Cyan, Shu-zo, and Darudayu. As Darudayu fights against the monster, Cyan discovers that the Dark Monster is actually Criticrista's Rosia.