Pls help me find This anime

I really want to watch it again só If u know it pls Tell me

So theres 2 sisters (children) that lived in a cabin that snowed Strongly, and the local of It was always changing names

Later on the Episodes It shows them already grown up (prob Still Teenagers) and they were in a trip (i think?) 

In the final of the Episodes It is show that they could Go back to the cabin and be children 

If u know it pls Tell me pllssssss