The Supernatural Studies Club meets Miyamura's sister, Leona, in their search for the seventh witch. She has dropped out of school in order to escape from that witch's power to erase memories. The instant one learns her name, all of their memories related to witches will be erased.
As such, their erased 
memories will never return.
Deswegen werden sie ihre gelöschten
Erinnerungen nie mehr wiedererlangen.
Por esa razón, sus recuerdos 
jamás regresarán.
Por esa razón, sus recuerdos 
jamás regresarán.
Désolé,
Pertanto, i loro ricordi perduti non torneranno più.
E então, as memórias 
apagadas nunca voltarão.
В общем, их стёртые
воспоминания не вернуть.