Hundreds of years ago witchery/witchcraft was practiced heavily in Europe, Africa and Asia. It has been found that between 11th and 19th century as many as 9 million (90 lac) women, suspected witches with supernatural powers, were mercilessly killed in these regions. In India, eastern and northern India had witnessed many incidents of witchcrafts and witch-hunts. Every such incident had a story. Kaalo's story is inspired by one such folktale about a Witch named Kaalo who used to sacrifice young nubile girls for her immortality.

Kaalo was a witch who lived in Kulbhata during the 18th century. She was killed and buried by angry villagers for sacrificing young nubile girls to satisfy her greed for immortality, but her fear lived on. Year's later villagers spoke of Kaalo's sightings yet again. They claimed she was even more angry and dangerous... And she was back to finish what she left incomplete... Kulbhata was vacated overnight by scared villagers.