Baba-yaga

A mysterious disappearance of a girl happened at a camp held by an association for kids some years ago--- Since then, the association didn't hold any action. And now, the association decided to hold an alumni. In order to look for " Yamauba," Honoka Inumaru witnessed at the camp, she joined the camp with Mizorogi, but…? Who Yamauba really is, and what happened to a girl who disappeared…!? A unique suspense story written by a genius duo!
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.
(Source: Manga Updates)