Rei

Rei is a minor character from the anime film, Perfect Blue, directed by Satoshi Kon.

History
Rei is a singer in the pop music group CHAM! After Mima left, Rei and Yukiko become more popular, which results of them getting into the best singing group charts.

She does seem to care about Mima, even after she changed careers. She showed some concern over Mima after hearing of her photo shoot with Murano. In one scene in the film, Rei and Yukiko are seen being on their radio talk show and when they bid goodbye to the audience, and Mima's apparition appears. Although Rei is happy to see Mima, she is shocked when Mima suddenly leaves and goes after the apparition. However, this all could've been a dream sequence that Mima had.