Alps - Kiken Na Mori Onigokko/危険な森 鬼ごっこ

Alps from Kiken na Mori Onigokko, an anime by studio Magin Label.

It's a derivative work of Alps and the Dangerous Forest/アルプスと危険な森, a game by developer X-Rabbit

Now in Illustrious. Might update when episode 2 is out. I still don't know what that thing in her collar is supposed to be.