Nijigasaki High School Idol Club

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 9 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.

Nijiyon
Nijiyon is an official 4-koma series that depicts the lives of the Nijigasaki High School Idol Club. The comic is illustrated by Miyakohito and published every Tuesday.

Season 1 is on the School Idol Festival: ALL STARS website.

Season 2 is on Dengeki G's website.

Season 3 has been confirmed. Additional details have yet to be announced.

Lunchbreak Broadcasting Room
The Love Live! Nijigasaki High School ~Lunchbreak Broadcasting Room~ is a radio show about the idols. It includes radio dramas of the Nijigasaki girls as well as other information. The main personalities are Miyu Kubota, Tomori Kusunoki, and Chiemi Tanaka. New episodes of [https://hibiki-radio.jp/description/llniji/detail Love Live! Nijigasaki High School ~Lunchbreak Broadcasting Room~] (ラブライブ！虹ヶ咲学園 ～お昼休み放送室～) are published on HiBiKi Radio Station.

Anime Adaption
On December 15, at the end of Day 2 of the Love Live! Nijigasaki High School Idol Club First Live with You! live, it was officially announced that an anime adaption would be made for the Nijigasaki girls. It was announced with the tagline "Let's Fly Past That Rainbow". News is yet to come of a release date or plot, and how it may affect the storyline of the idol club's origins as stated in the Love Live! School Idol Festival ALL STARS main story.

Trivia

 * Unlike µ's and Aqours, they are not a 9-member unit but instead mainly compete as solo idols.
 * Three of the group members were the winners of a popularity poll for Love Live! School idol festival, while the remaining six are original characters.
 * Before the project was announced, a popularity poll started in Love Live! School idol festival which asked the players to vote for their favorite character with the "N" rarity. Emma Verde won in first place, Shizuku Osaka in second place, and Kanata Konoe in third place.