In the future after humanity has declined, a human child becomes the subject of a certain beastman's research... A serious 32 page standalone manga story featuring their meeting and parting.
They were told to not fear death to protect the mountain. But the mountain won't die for them. What they saw beyond the path where humans disappeared was---
Kasumi gets lost in the shrine near the school on her way home, and a mysterious girl's power makes her unable to descend the mountain. Can the two return home safely? Who is the mysterious girl?