Graduation draws near for Yui, Ritsu, Mio and Tsumugi, the four 3rd-year students of the Light Music Club. They, together with Azusa, decide to go on a post-graduation trip. Their destination, decided by Lot, is London!

A tale of delinquent and lazy school girls. In their efforts to cut remedial summer math class, they end up poisoning and replacing the school's brass band.

Per gli adolescenti disadattati Hunter e Kevin, la strada verso la gloria è chiara: dedicarsi al metal. Vinci la Battaglia delle Bande. E sii adorato come dei.