@Triparadox Sorry for a 4 month old reply, especially in a topic you don't really fancy.
But I figured I'd least commend you for being able to judge something as "to my taste" instead of the mainstream "ermahgerd, this IS WRONG".
If you want my take, I honestly don't really care about the whole mono or poly routes (taking about manga in general, not just this one). All I want is a happy ending. If it's a Romance with one heroine, mono-ending all the way and I'll be happy as a clam. If it's a Romance with 2 heroines, poly-route with courage and I'll never be happier.
The problem is the 95% of manga where the author introduces extra girls for (shitty, unnecessary) "drama"; girls whose only fate is to have their heart broken. It's a pitiful existence, and it annoys me.
So, from my side. From the moment another girl is introduced (a girl with feelings for MC, obviously), poly- is the only real way. Otherwise, it just leaves a bad aftertaste.