篠崎 サチコ

"W h o d o y o u t h i n k y o u ' r e t a l k i n g t o , l i t t l e g i r l ? ! I ' l l w r i n g y o u r d a m n e d n e c k j u s t t o w a t c h y o u s q u i r m !"

The ghost of a young girl who shares the same surname as Ayumi. She is the main antagonist of Blood Covered and Book of Shadows. She is constantly seeking revenge for a mysterious reason, so she recreates the school in another dimension and starts kidnapping countless children, killing them in the cursed halls.