The Spider Demon (Sister or Daughter) in the Mount Natagumo Arc of Demon Slayer: Kimetsu no Yaiba. She was a member of the Spider Family. Sister is similar to her"younger brother," Rui. a girl in her early teens with a pale, milky-white skin complexion, snow white hair, pure white eyes with her silvery pupils  and possesses several red, dot-like patterns on her face. She wore a long white kimono and a hexagon-patterned juban underneath. ribbons in her hair with a large blue bead. She's cowardly 