Moeka Koizumi

It is not Tag. It is not Battle Royale. It is Battle Royale Tag. Sena walks up to the school rooftop to return Yudachi's handkerchief. Yudachi is not there and Sena falls asleep waiting. It is dark, she is confined and locked up at her school when Sena wakes up. The school has turned bloody red and the girls have to fight to the death. Who will survive the carnage is up to the girls. (imdb)

Karen and Hikari made a promise that, together, they would one day become the next theatrical stars. Real life got in the way of their childhood dream when Hikari moved away, but Karen never forgot her promise. Years later, the two friends finally have their chance when they're invited to a mysterious audition. However, the two are not the only ones who have trained for this moment, and they must now compete with others whom all share the same dream of performing on stage. (MyAnimeList)

This is a story of a far off star, a long time ago, and in the distant future. Two young girls, captivated by the glamour of the performance, exchange promises: "We'll become stars." "I'll wait for you on stage." (imdb)

Nijigasaki High School is known for their diverse subjects and the freedom they give to students. Second-year student Yuu Takasaki has been turned on to the charms of school idols, so she knocks on the door of the School Idol Club with her friend, Ayumu Uehara. Sometimes friends, sometimes rivals, the members of this club each contribute their own thoughts and motivations to the group. (Source: Funimation)

Ayumu returns from London with a girl named Isla, who wants to be a school idol. (imdb)