One of the members of S4, Yuzu Nikaidō appears to be in a good mood for some reason. And that reason is because Lilie Shirogane, the "Songstress of Tundra" is coming back to the school. Lilie is a second year student in the Flower Song Class, as well as being Yuzu's childhood friend. And in response to her fans, Lily will be having a school-wide come-back live--!
Ｓ４のひとり、二階堂ゆずは何やらゴキゲン。その理由は、『ツンドラの歌姫』と呼ばれる白銀リリィが学園に帰って来るから。リリィは歌組の二年生で、ゆずとはおさななじみ。そんなリリィが、ファンのようぼうを受けて学園ふっかつライブをすることになり――！
