Story Structure — 5 Plot Phases
Birthday Fractures
Ishigami begins with confidence in his married life, but unsettling messages and memory gaps disrupt that certainty. Apparent murder evidence at home vanishes, leaving him unsure what is real.
Key Events
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An Apparently Ordinary Life — Ishigami believes he has a happy, ordinary married life with Miyuki. Characters: Ishigami Taketo, Miyuki
Location: Unspecified
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Birthday Messages and Memory Gaps — Around his birthday, unsettling messages and gaps in memory begin. Characters: Ishigami Taketo
Location: Unspecified
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Signs of a Violent Murder — Ishigami finds signs of a violent murder at home. Characters: Ishigami Taketo
Location: Ishigami's home
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Evidence Vanishes — The body and blood disappear before the police arrive. Characters: Ishigami Taketo
Location: Ishigami's home
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A Doubtful Call from Miyuki — Miyuki calls from her mother's house, but Ishigami doubts whether the conversation is real. Characters: Ishigami Taketo, Miyuki
Location: Unspecified
The Other Marriage
As Ishigami loses basic details about his life, Ibuki tries to help and Han Yoo-ri enters the mystery. Han's revelations expose a former identity and marriage, deepening the conflict between Ishigami's memories of her and Miyuki.
Key Events
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Identity Details Slip Away — Ishigami forgets numbers, addresses, his workplace, and details of his identity. Characters: Ishigami Taketo
Location: Unspecified
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Ibuki Tries to Help — Ishigami's acquaintance Ibuki tries to help as his confusion worsens. Characters: Ishigami Taketo, Ibuki
Location: Unspecified
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Han Yoo-ri Enters the Mystery — Han Yoo-ri becomes connected to Ishigami's increasingly confusing situation. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified
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Warning of a Deadly Disease — Han says someone warned her that Ishigami had a deadly disease. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified
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A Former Marriage Revealed — Han reveals Ishigami's former identity and that he was once her husband. Characters: Ishigami Taketo, Han Yoo-ri
Location: Unspecified
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Two Homes and Two Wives — Ishigami realizes he may have had two homes and two wives, whose images merged in his memory. Characters: Ishigami Taketo, Miyuki, Han Yoo-ri
Location: Unspecified
Clues Behind the Disappearance
Candles, chemical formulas, and a hidden body become part of the investigation. Ishigami suspects that someone tried to erase the crime and prevent him from returning to his former life.
Key Events
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Candles and Chemical Clues — The investigation uncovers candles and chemical formulas linked to fragments of Ishigami's former memories. Characters: Ishigami Taketo
Location: Unspecified
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The Hidden Body — Evidence from the investigation involves a carefully hidden body. Characters: Ishigami Taketo
Location: Unspecified
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A Suspected Cover-Up — Ishigami suspects someone close to him erased the crime to prevent his return to his former life. Characters: Ishigami Taketo
Location: Unspecified
The Scientist's Explanation
Sato explains the dormant virus and the treatment that altered Ishigami's brain. As the treatment reverts, Ishigami's memories return while the danger to his brain increases.
Key Events
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The Dormant Virus Explained — Sato explains the dormant brain-cell virus, its possible effects, and Ishigami's reverting treatment. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Unspecified
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Memory Returns as Danger Grows — Ishigami's memories return and the overlapping identities disappear, while the virus threatens his brain. Characters: Ishigami Taketo
Location: Unspecified
Research Under Threat
Ishigami confronts Sato, threatens to use nitroglycerin, and demands the research files and the truth. He learns that his transformation began as a failed attempt to conceal the research and prepares to force Sato to undo the damage.
Key Events
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Nitroglycerin Ultimatum — Ishigami threatens to use nitroglycerin unless Sato gives him the research files. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Unspecified
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The Experiment's Purpose — Ishigami learns his transformation began as a failed attempt to conceal the research. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Unspecified
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A Desperate Demand for Repair — As his condition worsens, Ishigami prepares to force Sato to undo the damage. Characters: Ishigami Taketo, Sato Eisuke Hakase
Location: Unspecified