Tsutaya,as shown above, made a post that includes the voice cast of the drama CD for Nayuta no Kiseki. Knowing the drama CD’s of the past, this is likely to be at least part of the cast of the game, as well.
Kaori Mizuhashi
Ai Kayano
Kenichi Suzumura
Ayana Taketatsu
Thanks to @Overthebarrier for catching this, too!