This was very cute, but also not something I’d read more of. The appeal of this comic is for cat lovers and readers who want to see a sweet relationship between an older (human) brother and his baby sister. Nekota’s high school friend is a little obsessed with his sister tho, but it hasn’t exactly gone into creepy territory yet. Hope it stays that way. 

The worldbuilding consists of anthropomorphic cats living amongst human beings. In Nekota's case he was adopted by a cat family, but I don't know if that's the standard. There's a preschool boy in Neneko's class that had a cat older brother too and no one bats an eye. Is that kid adopted too or can some cat family have human kids??? I'm thinking way too much into this. Just accept the world as it is.