Four aspiring female musicians getting through high school the only way they know how—by starting a band! Yui is the lead guitarist (though she's never played before), Tsumugi the keyboardist, Mio the bassist, and Ritsu the drummer. With their big show at the annual school festival getting ever closer, the girls will have to practice hard—while dealing with homework, boys, and lots of other hilarious mishaps along the way—if they want to truly rock!