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Octavia Meyer (オクタヴィア・メイヤー Okutavia Meiyā) is the younger sister of Emma. She is a witch from the Library who came, together with her older sister, Emma, to Itogami Island to assist Yuuma in freeing her mother, Aya, from the Prison Barrier.
The Meyer sisters once caused an incident in which a huge forest was destroyed overnight. It bacame known as the Ashdown Tragedy.
Labyrinth of the Blue WitchEdit
Banquet of the ObserversEdit