This type of interaction is only adorable in manga... irl it is so disgusting knowingly these idols will try to make themselves to look cute pretending to care their fans just for money to survive.
You just might have accidentally stumbled upon
the cornerstone of this manga's cuteness.
See, on one level, we as readers know that Urumin's treatment of Kimiya is honest and genuine because we can see through her POV. But… what if we can also be sure of that
because she's too ditzy to fake it?
The more I think about it, the likelier it seems that Urumin's candour and ditziness are inextricably linked. After all, if she could
fake being likeable… she would actually be liked, wouldn't she?