Not sure if you got a legit answer yet so here ya go:
Main ending is with just one.
Side stories on the other hand!! There is one for each of the other male leads exploring how that would go. We are nearing the end of the third now.
Afterwards we will recieve the harem ending!!
Thank dear gods of the book world. Their desire for their OTPs to thrive is why we can get these dear gifts.

Guys pls tell me this will end up as a reverse harem and she’ll end up with em all