Tokyo 7th Sisters (Tokyo 7th シスターズ) is a Japanese idol raising simulation and rhythm game released for iOS and Android in February 2014, developed and published by Donuts Co. Ltd. with music produced and published under record label Victor Entertainment. The game has a story mode (called Scout in-game) in which players search for idol cards while progressing through the story and a battle mode in which players battle other players or certain in-game characters using their idol cards.
A 77-minute anime film adaptation by LandQ studios and Toei Animation titled Tokyo 7th Sisters: Bokura wa Aozora ni Naru was scheduled to air in Summer 2020, but has been delayed to February 26, 2021 due to the COVID-19 pandemic.
The film is directed by Takayuki Kitagawa, with Masakazu Sunagawa serving as assistant director, Yosuke Kikuchi designing the characters, and Yoshiaki Dewa composing the film's music.
The story centers on "new generation" idols from the studio "777 (Three Seven)", referred to as Nanastar, in the year 2034, in a future where idols are considered a thing of the past. The player acts as the manager of Nanastar, whose job is to recruit and train a number of different girls by collecting and leveling collectible cards. The cast of characters includes more than 50 fully-voiced, unique idols from different backgrounds.
Source -
Official Website