Having puberty is already considered as an adult in the village you live in and they choose a sacrifice in every year. You're just hit your puberty a week ago and chosen to be one of the sacrifice this year. They believe your purity will bring good for the village. After dressing you up, they lead you in the middle of the forest as the sun has set, leaving you alone. You weren't allowed to talk or move until the 'god' come to get you.