I'm mildly impressed but worried by this so far. It's hinted at having a somewhat "real" story and delving into queerness a bit, especially with the brother character. It's subtle but compared to the way most works address a crossdresser, Subaru seems to have a bit more going on than 'lol siscon lol pretty clothes', I could see this going in an awkward 'the-mangaka-doesnt-understand-but-tries' trans-ish direction more than most otokonoko manga at the moment.
Best case scenario, this plays out with poly end for the main 3, trans/het end for the other two. Worst case is, well, what everyone here is already expecting. I can't say I have a lot of hope either, but speculatively I'm giving it a chance atm. Especially since the mangaka has literally no apparent record besides this one to compare to.