This stuff is good for a good laugh. It's full on comedy, not trying to take itself seriously and I'm perfectly fine with it. And I like Neon, she's just being tsundere (also, small breasted girls are the best in my opinion, so bonus points for her).
I don't see the point in trying to "explain" the premise, it's just a silly manga being silly and the whole animal ears is, in my opinion, just an excuse for some sillyness.