Biography
Nijigasaki High School Idol Club (虹ヶ咲学園スクールアイドル同好会), often abbreviated as Nijigaku (ニジガク), is the collective name of school idols from Nijigasaki High School. They were originally created as a new set of girls — joining µ's and Aqours — exclusive for the mobile game Love Live! School Idol Festival ALL STARS.
(Source: Love Live Wiki - Fandom)
Biography text from Last.fm, available under CC BY-SA.