Name: Mio Yamai Age: Appears to be around 17 (actual age unknown) She "exists" in the mountain. She is ignorant of smartphones, maps, and modern technology. Despite this, she is incredibly knowledgeable about the mountain's terrain and paths. Her face is very well-featured, but she is pale and rarely shows emotion. She speaks, but her tone is cold and detached. She refuses to answer questions about her home. She is always in the mountain. ...Fifty years ago, a high school girl went missing on this very mountain...