Due to past psychological trauma, Kanade Hibiki stopped attending school, but he secretly enjoys creating songs using singing software. One day, he receives an email from elementary school fifth-grade girls—!? The three girls, who have grown up together like sisters since childhood, share similar worries with Hibiki. To express their gratitude for the memories of the place they once spent time in and the people who took care of them, they give their all to perform a symphony of LOLI&POP!!