A live concert in the Love Live franchise held at Saitama Super Arena on January 18 & 19, 2020, celebrating the franchise's 9th anniversary by uniting its first three groups together: µ's, Aqours and Nijigasaki High School Idol Club.

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。

Luck, an S-rank mage in the hero’s party, makes a last stand against the Demon King to save his companions. When he finally returns victorious, ten years have passed, and the world praises him as a legendary hero who died in battle. Unable to reclaim his former life, Luck conceals his identity and begins again as “Lock,” an F-rank adventurer forging a future in a world that moved on without him.