Obviously Poly is the best route, but I'd be fine with anyone who isn't smell girl. I really don't like how rude and territorial she can be. Hopefully, if the different girls do interact with each other they start to like each other, as well, to boost the possible poly ending. I hope it doesn't become the normal harem troupe of "Bitches being bitches" and have them all snapping at each other and talking shit. I have faith Tamamusi is more wholesome than that or at least creative enough to make the story satisfying, with the direction it's going. (Hope those won't be my famous last words)
Looking forward to seeing more of kiss girl in Ch. 7. She only seems okay, to me. But, I thought the same of Hearing Tomboy, until after her chapter. I really like her now, but Touchy Camera Boobs and teacher are probably still my favorites. But, only by a bit now.