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CHAM! is the pop band who at the beginning of the film are singing with Mima one last time due to her career change by the time she turned 21. The other members of the band are Rei and Yukiko. After Mima leaves the band, Yukiko and Rei keep performing as a duo.
"The Angel Of Love" is the first CHAM! song heard on the film, as it's performed in the concert in the beginning. The song can later be heard in different parts of the film.
CHAM! can be seen growing in popularity even after Mima's departure with the new song "Alone, But At Ease".