I just realized, at the end there, the only thing Rentarou said about Hahari was that she was rich. Not anything like “she’s very motherly towards everyone” or something like that, just money. I mean yeah it’s true, but it’s also kind of surface level, especially for Rentarou.
I know he doesn’t mean anything bad by it, it’s just strange is all. Everyone else got something about their personality or intrests, except Hahari.