Corpse Party: Book of Shadows (2016) Timeline Explained – Every Event in Order

Ayumi bites a bone once owned by Sachiko Shinozaki as a desperate attempt to change the past. After losing her friends in the original tragedy, Naomi has been hospitalized for months. Ayumi's sister Hinoe had been researching ways to fix what happened, and Ayumi believes that sending Naomi back with knowledge of the future is their only chance to prevent at least some of the deaths. The bone serves as a conduit for the supernatural ritual, pulling Naomi back into the haunted school.

Foreshadowing: This action is hinted at earlier when Ayumi explains that her sister Hinoe has been researching ways to set things right.

• ayumi shinozaki
• bone ritual
• time travel
• naomi nakashima

Sachi is the resentful twin sister of Sachiko Shinozaki. While Sachiko is the main vengeful spirit terrorizing the students, Sachi is a separate entity who was dormant until Sachiko rose again. When Sachiko's power resurged, Sachi awakened as well. Hinoe explains that Sachi is the one who emerges from Seiko's body after Seiko is decapitated, finishing off Touko. The twins represent two aspects of the same tragedy, Sachiko's direct vengeance and Sachi's deeper, perhaps more insidious resentment.

Foreshadowing: The presence of Sachi is foreshadowed early on when Hinoe mentions that Ayumi's plan hinges on an entity named Sachi.

• sachi
• sachiko shinozaki
• twin spirit
• resentful twin

The Book of Shadows is a forbidden artifact that holds the power to rewrite fate itself. Hinoe realizes that Ayumi's initial plan is flawed because it lacks two crucial elements: the Book of Shadows and Sachi. The book contains the dark magic needed to alter the events that have transpired in Tenjin Elementary School. It is the only thing powerful enough to potentially undo the cycle of deaths, but using it comes with tremendous risks, as evidenced by the horrifying ending when Naomi opens it.

Foreshadowing: Hinoe warns early on that the plan requires both the missing bone and the Book of Shadows.

• book of shadows
• forbidden artifact
• dark magic
• sachiko

The reverse charm proves inert because the supernatural events at Tenjin Elementary cannot be undone so easily. After Naomi places Sachiko's mother's necklace on her, pushing her toward a moment of sanity, the group attempts the reverse ritual to return home. However, the charm has no effect, history cannot be rewritten through simple rituals. The spirits' anger and the tragedy are too deeply rooted, requiring something far more powerful like the Book of Shadows to potentially change anything.

Foreshadowing: Ayumi admits earlier that saving Yui and Mayu remains unlikely, hinting at the limitations of their plan.

• reverse charm
• ritual failure
• sachiko
• return home

Yuya Kizami is revealed to be deeply unhinged and responsible for multiple deaths throughout the story. A found video camera shows him stabbing Emi Urabe to death while she cries. Further investigation reveals he also killed Ryosuke Katayama and Sakutaro, the headless body the group discovers belongs to Sakutaro. Unlike the other characters who are fighting to survive the spirits, Yuuya is a human threat who actively hunts and murders his classmates, making him as dangerous as the vengeful spirits themselves.

Foreshadowing: The discovery of Sakutaro's headless body early on signals that human violence is contributing to the cycle of deaths.

• yuuya kizami
• emi urabe
• murderer
• sakutaro
• deaths

After following Sachiko's voice to the book's location, Naomi finds herself back in the real world. She opens the Book of Shadows and pleads, "Please let everyone live!" The room trembles as her friends' voices echo around her. However, instead of saving them, a grotesque creature composed of the bodies of her dead friends, including Sachiko, crawls into the room. This horrific fusion represents the dark consequence of attempting to reverse fate through the forbidden book, leaving Naomi's ultimate fate unknown in a terrifying cliffhanger.

Foreshadowing: Hinoe's warnings about the Book of Shadows being a forbidden artifact foreshadow the dangerous consequences of using it.

• book of shadows ending
• naomi
• creature
• cliffhanger
• grotesque

Naomi uses Sachiko's mother's necklace to repel the vengeful spirit. The necklace, belonging to Sachiko's mother, triggers a moment of sanity in Sachiko, buying the group a brief period of safety. Sachiko's spirit is so consumed by resentment that even traces of her human past, like her mother's belonging, can momentarily break through her rage. Naomi later places the necklace directly on Sachiko, which partially calms the spirit and allows the survivors to attempt their escape.

Foreshadowing: This protection mechanism connects to Sachiko's tragic backstory as a student who was bullied to death.

• sachiko necklace
• mother necklace
• protection
• repel spirit

Satoshi kills Yuuya with sulfuric acid in the science room after Yuuya lures the trio into a trap. Satoshi recognizes Yuuya's deception and confronts him. During the struggle, Yoshiki is killed, and a dying Satoshi uses a bottle of sulfuric acid to strike Yuuya's face, fatally wounding him. This desperate act is Satoshi's final contribution to protecting his friends from both the supernatural threats and the human menace that Yuuya represents.

Foreshadowing: The science room setting foreshadows the use of chemicals as the confrontation escalates.

• satoshi mochida
• yuuka
• sulfuric acid
• science room
• death

The Sachiko Ever After is a cursed charm performed by the Byakudan Senior High students at the beginning of the film. This ritual involves reciting an incantation tied to Sachiko Shinozaki, the vengeful spirit of a girl who died after being bullied in Tenjin Elementary School. Performing the ritual immediately draws the students back to the haunted school, triggering the chain of events that defines the movie. The ritual essentially opens a gateway between the living world and the spirit realm where Sachiko dwells.

Foreshadowing: The ritual is performed at the very start, setting in motion all the subsequent tragedy.

• sachiko ever after
• ritual
• curse
• tenjin elementary

Ayumi admits early on that saving Yui and Mayu from their fates remains unlikely because their deaths are deeply embedded in the time loop's fixed events. While Naomi is sent back to change what happened, the supernatural rules governing Tenjin Elementary are rigid, certain deaths are seemingly predetermined by the nature of Sachiko's curse. The only hope is to break the cycle entirely through more powerful means like the Book of Shadows, rather than trying to save individual victims.

Foreshadowing: This limitation is established when Ayumi explains the plan to Naomi upon her return.

• yui
• mayu
• timeline
• impossible save
• fixed fate

Seiko is decapitated by a figure claiming to be Sachiko Shinozaki. However, this is actually Sachi, Sachiko's resentful twin sister, who emerges from Seiko's body after the decapitation to finish off Touko Kirisaki. The dual nature of the spirit threat means that even when one aspect appears to attack, another may be working behind the scenes. Sachi's emergence demonstrates that the supernatural danger is more complex than a single vengeful spirit.

Foreshadowing: Hinoe's mention of Sachi as a separate entity foreshadows her manifestation.

• seiko shinohara
• decapitated
• sachi
• touko kirisaki

Sachiko's power grows as the story progresses, particularly when she ascends to a new level of threat. This occurs after the survivors re-explore Sachiko's corpse and place the necklace on her, pushing her toward a moment of sanity. However, this act seems to trigger an even more intense version of Sachiko, symbolizing how the cycle of violence and vengeance only deepens. The more the living try to fight back, the more dangerous the spirits become.

Foreshadowing: The discovery of Sakutaro's headless body signals the repeating cycle of deaths.

• sachiko rise
• increased threat
• ascension
• spirit power