Season 1

It's Yui Hirasawa's first year in high school, and she's eagerly searching for a club to join. At the same time, Ritsu Tainaka, a drummer, and her friend Mio Akiyama, a bassist, are desperately trying to save the school's light music club, which is about to be disbanded due to lack of members. They manage to recruit Tsumugi Kotobuki to play the keyboard, meaning they only need one more member to get the club running again. Yui joins, thinking it will be an easy experience for her to play the castanets, the only instrument she knows. However, the other members think their new addition is actually a guitar prodigy...

부원이 모자라서 폐부 위기에 처한 경음악부에 4명의 동갑내기 여고생이 모였다! 모두 귀엽디 귀여운 여자아이지만, 경음악부 활동 면에서는 그리 믿음직스럽지는 않은데…! 거기다가 1명은 악기나 경음악에 대해서는 전혀 아는 바 없는 초심자~! 정말 이래도 되는걸까?! 그래도, 자, 연주 개시합니다!