I hate to break it to you… but having a pure romance in Manga after the year 2020 is apparently illegal in Japan. Seemingly by law, every single romantic manga has a secondary love interest introduced, usually against the authors will, and this one just slipped through the cracks.So where is the author going with this new robot girl?
I highly doubt the author will have her actually have sex with Roni, so is she just gonna be there to annoy Amona into being more up front with Roni?
That or she will die to some new villain and kick off a drama arc, going by the sneaky foreshadowing that her crystal is important and removing it may kill her.