Cyan Hijirikawa longs to join the band at school, but is too shy. While worrying about it at home, she's transported to another dimension…

Cyan learns more about Sound World and meets SHINGANCRIMSONZ. She sees the power of music firsthand when she watches them play.

Plasmagica goes to see the concert of a popular band called Tsurezurenaru Ayatsuri Mugenan and are taken in by their originality and stage presence.

Plasmagica hasn't performed enough concerts to play in the Grateful Rock Festival, and Aion's gloominess is causing problems with his bandmates.

The day of the Grateful Rock Festival has finally come, and as the bands get ready to perform, Cyan worries about the dark monsters...

It's time for the final showdown against Dagger! Will Cyan and the others be able to defeat him once and for all?!