Welcome to Toei Slaughterhouse(2021)

The film follows Saki (Momotsuki), Mei (Kudo), and Kaho (Teramoto), the members of the budding idol group called Wish as they are set to appear in the sequel of Toei's hit movie, Yugami. Toei Movie Studios is a place where a lot of popular movies and dramas are filmed, but this studio also has an untold secret.