The first in a trilogy of Love Live! Nijigasaki Gakuen School Idol Doukoukai films that continues the story beyond season two and the OVA.

栞子·米娅·岚珠加入后13人的「虹咲学园学园偶像同好会」。

其他学校也参加了的庆典「第2回学园偶像祭」，

还有同好会的First Live——。

在流转的季节中，成员们有时作为对手，有时作为同伴，

胸怀各自的心意展开活动。

这时，在刚从伦敦参加完两周短期留学而回国的步梦身旁，

有一位憧憬着学园偶像的短期留学生艾拉。

以栞子为首的同好会成员为了支持她的梦想，

计划开展学园偶像体验企划。

In a world very much like our own, great race horses of the past have a chance to be reborn as "horse girls"—girls with the ears and tails of horses as well as their speed and endurance. The best of these horse girls go to train at Tokyo's Tracen Academy, hopefully moving on to fame and fortune as both racers and idols.

Special Week, a high school horse girl from the countryside, has just transferred to Tracen, and she's determined to fulfill her promise to her mother to become the best horse girl in Japan. On her way to school, she takes a pit stop at the race track and instantly falls in love with Silence Suzuka's style, becoming determined to race on the same team as her.