Myrtenaster's life is turned on its head when she finds herself going from a singer in Mirror City to a warrior in its alternate universe — White Castle — once more. Armed with magical powers and her trusty rapier, she must find her way back out of the stronghold once more. She will face new challenges and numerous enemies, but will she be able to survive the encounter?

Based off of the character Weiss Schnee from RWBY, and is set after the White trailer.