Totsukuni no Shoujo - Siúil, a Rún

It is a tale full of sorrow. From now let's recite a slow and beautiful story from long ago.

Shiva, a young girl who loves to stroll about in the countryside, lives in an otherwise deserted village with her guardian, a wendigo-like gentleman known only as “Teacher.” He forbids her from going outside, so she won't be cursed, but Shiva's curiosity makes her yearn for more. What is really behind the mystery of the curse from the Outside?

In a world split between the Inside and the Outside, those living in both realms are told never to cross over to the other side, lest they be cursed. A young girl named Shiva lives on the other side, in a vacant village with a demonic guardian known only as "Teacher." Although the two are forbidden to touch, they seem to share a bond that transcends their disparate appearances. But when Shiva leaves Teacher’s care to seek out her grandmother, the secret behind her mysterious living arrangement comes to light.