Reiko Ozaki
About
Ozaki herself was once part of an idol duo with another girl, Satomi Kondou. Known as the idol unit riola, Reiko never got past F Rank due to slanderous comments about their unit and their office's president that were posted online. This caused her to hate the internet and drives her desire to protect Eri from it.
The song Precog was going to be her last image song, but went unfinished by the end of her career. She later allowed Eri to finish the song and use it as her own.
(Source: project-im@s wiki)