Sayaka Imamura

She plays the part of Rabian Pink/Purple Rayer (Remy) on the "Cosprayers" show and is especially skilled at imitating voices.
Her short height and childish behavior commonly lead people to believe she is younger than her actual age of 14.
Inamura is aware that Naoto is the script writer ,she also has feelings for Naoto and get frustrated because he never notices her.

(Source: Wikipedia.org)

It is suggested that she is the one who is eavesdropping when Mistuki is having a secret conversation with Naoto in which that he'll be the show's scriptwriter, thus telling everyone of the cast that he (Naoto) is actually not a cameraman in training.