How did I miss the first two chapter of this manga, glad I've found it now though. So far I love it.
Anyway, I usually really don't like poly endings but here I'm nearly inclined to say that I wouldn't mind it. Right now I do tend more towards Fukatsu but that's just because she's had a bigger focus so far, while Sayo hasn't done much yet. I do wonder if the two different shapes of love arrows actually mean anything.
Also, I'm gonna guess that the one the nurse loves is their home room teacher. Wonder if it's mutual.