In Tokyo's Chiyoda-ku is the traditional school Otonokizaka High. Second year student Kosaka Honoka discovers the school will be closed in three years. In order to avoid being closed, the school must increase its number of prospective students.

Honoka and friends form a school idol group to entice more students to attend. When pointed out their group could have the opposite of their desired effect, Honoka becomes dispirited.

Honoka's group idol name is "µ's" and the group debuts their first song. Their popularity grows at school, and they have their first concert.

µ's has officially become a school club! The student council vice president asks Honoka why she is leader, if she does not have any responsibilities in the group. So, the group sings and dances to determine their new leader!

µ's grows to nine members with the addition of Eli and Nozomi. The group's School Idol ranking is rising to 50th, but they must reach 20th place to participate in Love Live! They must take drastic measures to reach their goal.

It is a new semester and the group is ranked 19th, which is high enough to be considered for Love Live! µ's next event is at the school festival, but they are forced to perform on the roof.

µ's cancels its school festival concert after Honoka collapses. Honoka learns the group has been revoked from entry into Love Live. However, due to their success, the school is going to admit new students next year.

Honoka quits being a School Idol after she failed to realize Kotori was suffering. µ's goes on hiatus, and Honoka is left without a goal. Honoka arranges for Umi to meet her, and tells her how she really feels.

Having avoided the closure of Otonokizaka High, the members of μ’s return to their everyday lives. News of a second Love Live reaches the girls. This time teams that win their regional preliminaries move onto the finals.

μ's is invited to perform as a guest at the Akihabara Halloween event. They need local support to win the Love Live. By putting on a impressive performance, μ's hopes to close the gap between themselves and A-RISE before the final preliminaries.

A physical examination reveals Honoka has gained weight. Umi scolds her for her carelessness, and when she attempts to put on the outfit from the first concert...

The day of the final preliminaries, the second years try to make their way to the event after giving an address from the student council at the school's information session, but their means of transportation are paralyzed due to the snow. The girls try walking through the snow to reach the event, but...

When the Love Live ends, so will μ's. The day before the event, the members reach a unanimous decision. As usual, the girls gather on the roof and end their practice amidst a friendly atmosphere, but when they realize it's their last practice together, they find themselves unable to go home and end up spending their last night together at school at Honoka's suggestion.

Today is graduation. Having finally finished her farewell address, Honoka heads to school in high spirits. At the gates she meets Rin and her friends. They head to the club room together, where they find a trophy and flag.