Love Live! Nijigasaki High School Idol Club is a Japanese multimedia spin-off project from the Love Live! series and its game series Love Live! School Idol Festival. It was first introduced in 2017 as "Perfect Dream Project" and was initially created as part of the game Love Live! School Idol Festival All Stars. Unlike μ's and Aqours, the previous groups from the franchise, they are a group of individual school idols who compete with each other while working together to keep their school idol club alive. Together, they are referred as the Nijigasaki High School Idol Club.

They are featured in the spin-off game Love Live! School Idol Festival All Stars along with μ's and Aqours. They also appear as SR rarity cards in Love Live! School Idol Festival. The girls were initially split up into groups of three to begin activities in three different apps before their addition to the game: Dengeki Online website (Kasumi, Karin, Setsuna), Famitsu App website (Ayumu, Ai, Rina), and the game's official website (Emma, Shizuku, Kanata). Each place is working as a separate room or branch office for the Nijigasaki High School. Later, they were officially split into three subunits: DiverDiva, A・Zu・Na, and Qu4rtz.

An anime television series adaptation by Sunrise (credited as its parent company Bandai Namco Filmworks since Season 2) aired from October to December 2020. A second season aired from April to June 2022. An anime television series adaptation of the spin-off manga Nijiyon: Love Live! Nijigasaki Gakuen School Idol Dōkōkai Yon-Koma, titled Nijiyon Animation, aired from January to March 2023. A second season aired from April to June 2024. An original video animation episode, Love Live! Nijigasaki High School Idol Club Next Sky, was released theatrically in Japan in June 2023. A trilogy of theatrical films based on the project is slated to release in the future, with the first film released in September 2024.