Read manga: Love Live! Superstar!! Chii-Chan Buchou Wa Yuunou Desu!

manga
Summary:

Chiisato Arashi is the president of Yuigaoka Girl's High School Idol Club. They are working hard to win the Love Live! competition. Singing, dancing and performing on stage... Liella! is still in a lot of trouble!"No problem, I, Chiisato Arashi, will take care of everything!"