There exists a pretty well known seiyuu (of the time) called Nitta Emi. She voiced Kousaka Honoka of LoveLive! a school idol. She's called by the nickname of Emitsun by fans.
I am 200% this character is a reference to her (idol/actor talent agency scouter).
I got curious and searched up this series and found out the LN is already finished. There are only 8 volumes so I wonder if the manga will fully adapt it? I also kind of want to spoil myself and see how this series ends…