There's the first years (Hanayo, Rin, Maki), the second years, (Honoka, Umi, Kotori), and the third years (Eli, Nozomi, Nico).Cast Herd: µ's members form their own groups of three whenever they are not together.In real life, the members are "graduated" after their Final Live in 2016. They officially announce this in the movie, with their performance for the third Love Live! event at the Akiba Dome as their final performance.
Breaking the Fellowship: In the later episodes of the second season, they decide to disband after the third years graduate.Book Ends: This is done with the sub-units' album covers the members of each unit all wear the same outfits on the covers of their last singles as they did with their first singles.