Grandma

Grandma (Japanese: グランマ, guranma ) is a title given to female humans who are serving under Demons, who used to be Mamas and have proved that they are hardworking and can raise orphans in the Premium Farms like Grace Field House and Glory Bell. They are known to be previous "orphans" who have surpassed an insurmountable level of expertise in Litany Exams and have undergone hours of training.

They are superior to all of the caretakers. Their Job is to supervise and train new girls to become Sisters and then Mamas. The Grandma is not changed unless she passes away or the Demons decide that she is not qualified for the position anymore and can kill her.

Appearances
Their outfit consists of all-black long dress with puffed sleeves and black collar and buttons. Different grandmas are shown to wear different footwear overtime, Sarah was wearing a pair of brown boots just like the Mamas and Sisters during her service while Isabella wears a pair of black high heels and gray tights underneath.

The grandma position is abolished as Grace Field House was raided, Peter Ratri's unexpected death, and the last grandma's betrayal.