An eleven-year-old Japanese-American girl joins her performing arts school's J-Pop club, where the members form an imitation band of their favorite girl group, coming together from different corners of the school to help and support one another along the way.

When three noisy, mischievous rising stars of a British boy band come to Los Angeles to make their first album, they stay in the home of a record producer and her seventh-grade daughter, a talented but painfully shy singer-songwriter, urged by her best friend to step into the spotlight.

When he decides to tag along with his brother Rodrick's band, Löded Diper, Greg doesn't realize what he's getting into. But he soon learns that late nights, unpaid gigs, fighting between band members, and money troubles are all part of the rock 'n' roll lifestyle. Can Greg help Löded Diper become the legends they think they are? Or will too much time with Rodrick's band be a diper överlöde?