Totsukuni no Shoujo

A world is divided into two parts, the Inside and the Outside, with a warning against crossing between them to avoid a curse. A girl named Shiva lives in the Outside, in an empty village guarded by a figure called Teacher, who is described as demonic. Despite a rule forbidding physical contact, a connection exists between them. Shiva eventually leaves Teacher to find her grandmother, leading to the revelation of the truth behind her unusual situation.