The film starts with a group of students from Byakudan Senior High School who just performed the "Sachiko Ever After" charm.

Ayumi bites a bone that belonged to Sachiko, sending Naomi back in time to the haunted school.

Ayumi is unable to save Yui and Mayu from their fate and Seiko and Naomi discover Sakutaro's headless body.

There are two things needed to avoid a repeated death: the forbidden Book of Shadows and an entity called "Sachi".

Stunned, Kensuke demands an explanation but Yuuya stabs him too, revealing that he is insane and responsible for Ryosuke Katayama and Sakutaro's deaths.

Hineo saves Ayumi, Yoshiki and Satoshi from the evil spirits and clarifies that Sachi is Sachiko's resentful twin sister.