It depends what others you played. The "Cosplay Girl" in the store on That New Teacher is from Companion of Darkness, a good one to check out. Not going to list them all but I seem to remember there was a guest star credit on That New Teacher for them at the end of each chapter.
Damn it seems that I got caught off guard since I didn't realize Evermore is somewhat abandoned by the developer but not entirely but considering it is the last game of h_ntai story I am going to play next month, I will have to adventure again for another story.
There are actually two other appearances from Companion of Darkness too. During the scene when the MC is introducing Clarissa to Sophie, you can see Eda and Clara from that game if you look closely in the background. Took me such a long time to notice!
