Question: are ayumi and sachiko related?
Answer: Sachiko was the master of the cursed Heavenly Host Elementary School, and was a former student there. She is the daughter of Yoshie Shinozaki and Seiji Shinozaki, the younger twin sister of Sachi Shinozaki, the grandniece of Makina Shinozaki, and the second cousin once removed of Hinoe and Ayumi Shinozaki.