In the bustling backstage of a high school music competition, the members of the light music club, led by the ever-enthusiastic Yui, find themselves in a unique predicament. As they wait for their turn to perform, the girls' curiosity and hormones get the better of them, leading to an impromptu and intimate jam session of a different kind. Yui, ever the eager beaver, takes the lead, her fingers dancing not on her guitar strings, but on her wet panties, as she pleasures herself quietly. Ritsu, the drummer, follows suit, her hands rhythmically stroking her clit, while Mugi, the bassist, watches them, her own desire building as she begins to touch herself. Even the usually reserved Azusa can't help but join in, her fingers exploring her virgin pussy as she watches her friends indulge in their forbidden pleasure.