Fami

An unnamed woman with ringed eyes appeared at Fourth East High School and called Asa Mitaka her "little sister."

Appearance
She appears to be a young woman and was wearing a high school uniform. She is of average build and has relatively light hair. She has ringed eyes and 3 earrings in each ear, two of which are beads and the third resembling scales or possibly Pochita's pull cord.

Personality
She treated Asa kindly since they are "sisters."

War Devil arc
The woman arrived after Yuko was brought to the brink of death by Asa's sword attack. She told Asa that she could bring Yuko back to life, and that she would do anything for her sister. Yuko then was revived and gigantified in size, while the woman dissapeared.

Powers
The woman has the ability to heal that also causes the person being healed to gain great strength and size.

Trivia

 * Because of her eyes and the way she treated Asa, it is widely speculated that she is one of the Four Horsemen. It is unknown if she is the Death Devil or Hunger Devil; the scales of her earrings may resemble iconography commonly used in depictions of famine, lending credence to her being the Hunger Devil. There is also how the story has currently been following the usual order of when the horsemen come, such as Conquest then War then Famine.