Story Structure — 5 Plot Phases
The Birthday Fracture
Ishigami begins his thirty-fifth year believing he has a happy marriage. Unsettling messages, memory gaps, and a vanished murder scene destroy that sense of normality.
Key Events
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Ordinary Married Life — Ishigami believes he is living an ordinary, happy life with Miyuki after their marriage. Characters: Ishigami Taketo, Miyuki
Location: Ishigami's home
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Birthday Unease — On his birthday, Ishigami begins receiving unsettling messages. Characters: Ishigami Taketo
Location: Ishigami's home
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Memory Gaps Begin — Ishigami experiences gaps in his memory and cannot explain what has happened. Characters: Ishigami Taketo
Location: Unspecified
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Vanished Murder Scene — Ishigami finds signs of a violent murder, but the body and blood vanish before police arrive. Characters: Ishigami Taketo
Location: Ishigami's home
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Uncertain Phone Call — Miyuki calls from her mother's house, but Ishigami cannot tell whether the conversation is real. Characters: Ishigami Taketo, Miyuki
Location: Ishigami's home
A Life Remembered Twice
Ishigami's memory deteriorates, while Ibuki tries to help him. Han Yoo-ri introduces the possibility that Ishigami once lived under another identity and was her husband.
Key Events
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Uncertain Phone Call — Miyuki calls from her mother's house, but Ishigami cannot tell whether the conversation is real. Characters: Ishigami Taketo, Miyuki
Location: Ishigami's home
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Identity Erosion — Ishigami forgets telephone numbers, addresses, his workplace, and details of his identity. Characters: Ishigami Taketo
Location: Unspecified
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Ibuki Offers Help — Ibuki tries to help Ishigami as the memory disorder increasingly disrupts his life. Characters: Ishigami Taketo, Ibuki
Location: Unspecified
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Han Enters Mystery — Han Yoo-ri becomes connected to the mystery surrounding Ishigami's illness and missing memories. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified
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Disease Warning — Han says someone warned her that Ishigami was infected with a deadly disease. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified
The Two Wives Mystery
Han's revelation forces Ishigami to question whether he had two homes and two wives. Candles, formulas, and a hidden body connect the identity crisis to a concealed crime.
Key Events
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Disease Warning — Han says someone warned her that Ishigami was infected with a deadly disease. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified
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Former Husband Revealed — Han reveals that Ishigami once lived under another identity and was her husband. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified
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Two Homes, Two Wives — Ishigami realizes he may have had two homes and two wives whose identities became merged. Characters: Ishigami Taketo, Miyuki, Han Yoo-ri
Location: Ishigami's memories
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Hidden Evidence Emerges — The investigation uncovers candles, chemical formulas, and evidence of a carefully hidden body. Characters: Ishigami Taketo
Location: Unspecified investigation site
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Candles Trigger Memories — The candles appear to trigger fragments of Ishigami's former memories. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified investigation site
The Laboratory Secret
Ishigami suspects a laboratory connection and traces the deception toward Sato's research. The scientific explanation links the altered identity to a dormant brain-cell virus.
Key Events
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Candles Trigger Memories — The candles appear to trigger fragments of Ishigami's former memories. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified investigation site
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Erased Crime Suspected — Ishigami concludes that someone who knew him tried to erase the crime and block his return to his former life. Characters: Ishigami Taketo
Location: Unspecified investigation site
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Laboratory Suspicion — Ishigami suspects that a person connected with a laboratory is involved in the deception. Characters: Ishigami Taketo
Location: Laboratory
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Dormant Virus Explained — Sato explains research into a dormant virus embedded in human brain-cell DNA. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Laboratory
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Alzheimer Risk Revealed — Ishigami learns that the virus can awaken, destroy brain cells, and cause Alzheimer's disease. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Laboratory
A Race Against Erasure
The treatment begins reverting, restoring Ishigami's memories while exposing him to rapid brain-cell destruction. He confronts Sato with nitroglycerin and demands a way to reverse the damage.
Key Events
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Alzheimer Risk Revealed — Ishigami learns that the virus can awaken, destroy brain cells, and cause Alzheimer's disease. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Laboratory
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Treatment Reverts — Ishigami discovers that the treatment altering his brain has begun reverting to its original state. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Laboratory
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Threat With Nitroglycerin — Ishigami threatens Sato with nitroglycerin and demands the research files and the truth. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Laboratory
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A Race Against Memory Loss — With his condition worsening, Ishigami forces Sato to help undo the damage before his identity is lost again. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Laboratory
Ishigami comes home from work and discovers his wife dead. Just then, he receives a phone call from his wife and falls in utter confusion. Unexplainable things keep happening as Ishigami struggles to find his wife. Gradually, Ishigami realizes all his memories are gone and finds himself acting like someone else. What is his true identity?