Loved it! It kind of reminded me of that breakwater show which i enjoyed a fair bit too but i feel it exceeded for a start episode. We get a decent setting which logically brings the two new siblings together (and explains ones slightly hyper personality), no "long last siblings" or weird "just met" thing, parents remarrying makes sense (though they really could of used a bigger number than 3 years right? Not that 3 is bad but it implies they both must of met and dated pretty fast after losing their partners... though this is a minor detail and doesn't matter).
I like the two girls we have thus far, MC seem great all around, she is kind but wary and i liked that. I enjoyed the other girl too, she was happy and cheery, which always sits well.
In all i just really loved this episode, it's like Breakwater season 2, except they did a Yuru camp crossover and added a extra does of cuteness to the SoL factor... in short, my kind of show (and if it maintains this momentum, easily gonna be a top tier one for me to start the year).