The clueless boys of Sanada North High School never lack a new topic to dissect. Questions about girls are endless, the true meaning of being a man could be hidden in questionable chivalry, and there might be a moral side to silly pranks. With a different predicament always ongoing, the daily lives of high school boys are anything but boring.

Living an abnormal existence in Ogikubo, an intergalactic melting pot of humans and aliens as well as the only Space Immigration Zone on Earth, Luluco is a bubbly middle school girl who just wants to be normal. One morning, however, her father, who works at the Space Patrol, eats a volatile sleep capsule by mistake and is frozen solid! To make matters worse, Luluco accidentally breaks him, so she hurries off to his office for help. There, the chief of the Space Patrol, Over Justice, hires Luluco as a space temp worker for undercover investigations, so that the institution may crack down on crime within her school. Made to don the Space Patrol suit and sent on her way to mete out justice, Luluco attempts to maintain the image of a normal girl who does not stand out in any way. But she soon discovers that with the automatic systems and inherently zealous judiciousness of the Space Patrol suit, continuing to be normal will be more difficult than she thought.

Hot on the heels of the third year students' graduation, μ's is invited to New York in hopes of spreading the joy of school idols to other parts of the world. Due to the events of the recent Love Live!, μ's has reached eminent stardom which results in crowds swarming them whenever they appear in public. With the increased attention, however, comes a difficult choice. Having yet to publicly announce the decision they came to regarding their future, the young members of μ's are pushed to continue performing by rival group A-RISE, Otonokizaka High School, and even Love Live! itself. As leader, Honoka Kousaka is left wondering if the path they have chosen is truly for the best, as μ's must re-evaluate their choices and come to a final decision on what they want for the future. Love Live! The School Idol Movie depicts the final chapter in μ's story as the girls explore just what being an idol means to them as well as the bond that connects the nine of them together.

Arata is set to be expelled! The only way to save himself is to be taught more about the magic archives from the Trinity Seven themselves.