High school freshman Cocoa Hoto got lost and bumped into a coffee shop called "Rabbit House" while looking for a boarding house for the upcoming semester of her new school. Luckily, Rabbit House is the boarding house she's looking for, and to return the favor Cocoa starts working at the coffee shop alongside quiet and cool Chino, strong and athletic Rize, plus Chiya and Syaro from Japanese-styled coffee shop Amausaan, as well as the shop mascot rabbit Tippy, who sometimes doesn't quite act like a rabbit....

一所位于东京都千代田区的传统高校“音乃木坂学院”，因为入读的学生人数骤减，所以正面临着废校的危机。其中有三名少女想到一条妙计——成为偶像，只要她们成为偶像，学校的名气便会增加，而入读学生的人数亦会上升。就这样，九位个性鲜明的少女决定一起努力成为偶像，希望可以凭借偶像的名气增加生源来挽救自己所喜爱的校园。