Baba-yaga - Manga

In a forest on a mountain, a class is out on excursion. A girl strays from her group and meets a witch. She escapes, but when she groups up with her classmates no one believes her, except for her best friend. After the class returns to the mountain for a reunion after graduating, old memories resurface. Why does the girl still insist she saw a witch? Does she really believe it herself? From solelo: A witch named Baba-yaga lives deep in the forest. If you’re a good kid, she might save you on a whim. If you’re a bad kid, she’ll devour you.