Show by Rock!! begins with Cyan's love for rhythm games leading her to a musical adventure. She is transported to Midi City, a realm where music holds the key to power. However, the city is not safe from darkness as an evil plan looms over it. Cyan, an ordinary girl with extraordinary guitar skills, discovers her magical abilities and must use them to save the city. Will she be able to stop the darkness from taking over? Enter a world where music reigns supreme and Cyan, along with her new friends Chuchu, Retoree, and Moa, must fight to restore peace to Midi City.