The official movie comic anthology for Love Live! Sunshine! School Idol Project Over the Rainbow.
3 books with ~3 chapters each.
Each chapter is done by a different artist.

Taken from Riboninfo:

Karin is a student of an institute that's very strict, but then leaves class to be dedicated to street dance in a club called "Free Square," that is in fact, one of the best. One day while dancing with her friends a group of boys who play basketball arrive and Karin falls in love at first sight with their leader, Yuuma Seta. Some thugs want to be in the club and Yuuma challenges them to a game of basketball, but the thugs are cheating...

Side stories in:
Vol. 1 Pop n' Eight Beat
Vol. 2 Hug! (FUJIWARA Yuka)

From Manga Abyss:

1) Akaneiro Showtime
Akane Nonomura is a 1st year student in high school with a loud voice, body, and dreams. One day, Akane cried while reading a line from a script she accidentally received with an invitation from Kazuma to join the drama club. Now, she takes the stage as the lead in the play...!

2) Dengeki! Otome-ism
Amagi Shuri is the strongest girl in class because her father runs a dojo. She can't control this strength and someday found herself in a RPG-game with her classmate, the cold Nishina Kei...!

3) Ten wo Tsunaide

4) ACT!
A different version from the first story "Akaneiro Showtime"

Nagahara Miu is the former genius tennis player who mysteriously quit playing tennis four years ago. But now, Miu, forced to play a doubles tennis team match with her classmate Issei, once again stands on the court...?!

Haruka has a dog... A dog she ABSOLUTELY loves! Every single day, she gives him hugs and kisses~! Upon entering high school, she suddenly meets a boy...with the same name as her dog...looks like her dog...and acts like her dog in every way possible! Can Haruka resist the temptation of wanting to hug and kiss him like she does to her dog?

Crash is about a girl named Hana who has a very unusual gift. Her home is a talent agency and she helps her mother using her "gift". She literally has nosebleeds when she sees someone with celebrity potential. Naturally, this is a secret she keeps from her classmates. On the company's anniversary, Hana is sent to find a new awesome talent. And that's when the story unfolds...

Also included is a short story called Piyokko 24 in vol. 5.

The original series ended at vol. 7 and took a four month hiatus before resuming with a second part featuring Yui, Kazuhiko's childhood friend, as the main character.