So, Kuu made a post on Instagram asking teasingly where she might be.
It does look like California, but it's Winter so she must be somewhere more South.
But judging from her previous post yesterday, it's a place, where you can buy Milk cosmetics, which is based in the US.
So I guess most probably Hawaii?
There the temperatures might fit for her to wear a short top.
Anyway, cause she's teasing like that, it's probably work related, yay.