With the addition of Natsumi's younger sister, Onizuka Fumari, the new school idol club begins activities with three members. Kanon and Margarete are at the mercy of Fumari, who is calm and collected and perfect at dancing, but is also elusive. Although it has been decided that the three will participate in a remote live performance as their first stage performance, they are mismatched as they have different goals and stances on being school idols... In the midst of all this, Kanon suggests that the three of them write a song together. The song of Tomakanote, a three-person unit with different thoughts hidden within each of them, begins.