Rumi Hidaka (日高 ルミ)Rumi is Mima's manager. She is opposed to Mima's crossover into acting. She was a former idol singer.
It turns out she is the "real" Mima who was running a website called "Mima's Room" and sending the emails to Me-Mania. She then thinks of herself as pop-idol Mima. Using Me-mania's hands she exacted revenge on all who "spoiled" Mima's pure image in order for her to become an actress.
