Once upon a time, in a far, faraway place, there were two lands. The world was divided into an inner land and an outer land. People feared the outer land, inhabited by eerie beings, the carriers of curse. One day, on the border to the inner land inhabited by humans, one such being finds a girl on heaps of abandoned dead bodies. The girl says her name is Shiva and shows affection to the "being" who found her, calling him "Teacher."
 
This is a story of two people—one human, one inhuman—who linger in the hazy twilight that separates night from day. 
(Source: Crunchyroll) 
Note: Originally released as a movie-length OVA. As streaming on Crunchyroll, it is split into 3 'normal' length episodes.

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. 
 
(Source: Seven Seas Entertainment) 
 
Note: Bundled with the limited edition of the manga's 8th volume.

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. (Source: Seven Seas Entertainment)

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