S1, E1: Spring. As new students are deciding what club to join, Ritsu Tainaka takes her childhood friend, Mio Akiyama, along with her to observe the light music club. But all the members of the light music club have graduated, and the club will be disbanded unless four new members can be assembled. They add Tsumugi Kotobuki, who had come to observe the choir, to their ranks and as they search for one final member...