Story Structure — 4 Plot Phases
Eternal Winter Siege
A catastrophic explosion isolates Mifuse in perpetual winter, establishing a controlled reality enforced by religious doctrine. Masamune discovers Itsumi in the industrial ruins, forming an initial bond amid growing surrealism.
Key Events
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Catastrophic Mill Explosion — A massive blast isolates the town, trapping it in eternal winter. Characters: Masamune Kikuiri, Itsumi
Location: Mifuse Steel Mill
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Eternal Winter Isolation — The town cuts off from the outside world, frozen in time. Characters: Masamune Kikuiri, Itsumi
Location: Mifuse Town
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Sacred Machine Doctrine — Leadership enforces submission to a divine machine narrative. Characters: Masamune Kikuiri, Itsumi
Location: Town Square
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Blast Furnace Discovery — Masamune finds a feral girl living among the industrial ruins. Characters: Masamune Kikuiri, Itsumi
Location: Steel Mill Blast Furnace
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Bonding with Itsumi — The two develop a close relationship while exploring her origins. Characters: Masamune Kikuiri, Itsumi
Location: Blast Furnace Interior
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Conflicting Origin Theories — Contradictory claims about her divine or alien nature surface. Characters: Masamune Kikuiri, Itsumi
Location: Town Periphery
Fissures and Doubts
Sky cracks reveal summer imagery, destabilizing the town's perceived perfection. Vanishing classmates and conflicting origin theories push Masamune to question the constructed nature of their world.
Key Events
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Conflicting Origin Theories — Contradictory claims about her divine or alien nature surface. Characters: Masamune Kikuiri, Itsumi
Location: Town Periphery
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Sky Fissures Appear — Cracks in the sky reveal summer imagery, challenging the town's reality. Characters: Masamune Kikuiri, Itsumi
Location: Mifuse Skyline
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Sonobe's Vanishing — A classmate disappears after being enveloped by industrial smoke. Characters: Masamune Kikuiri, Itsumi
Location: School Grounds
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Reality Doubts Grow — Residents begin questioning the perfection of their constructed world. Characters: Masamune Kikuiri, Itsumi
Location: Town Streets
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Father's Diary Revelation — Masamune uncovers written records exposing the town's artificial nature. Characters: Masamune Kikuiri, Itsumi
Location: Kikuiri Residence
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True Identity Unveiled — Itsumi is confirmed to be Saki Kikuiri, transported from reality. Characters: Masamune Kikuiri, Itsumi
Location: Kikuiri Residence
Truth and Rebellion
A father's diary exposes Itsumi as Saki Kikuiri from the real world, triggering a decisive rebellion. Masamune organizes a disruption of the sacred machine ritual to secure her freedom.
Key Events
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True Identity Unveiled — Itsumi is confirmed to be Saki Kikuiri, transported from reality. Characters: Masamune Kikuiri, Itsumi
Location: Kikuiri Residence
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Ritual Disruption Plan — Masamune organizes a rebellion to stop the sacred machine offering. Characters: Masamune Kikuiri, Itsumi
Location: Town Hall
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Obon Festival Chase — A frantic pursuit unfolds during the visible Obon festival. Characters: Masamune Kikuiri, Itsumi
Location: Town Streets
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Train Escape Attempt — Itsumi is placed on a train bound for the real world. Characters: Masamune Kikuiri, Itsumi
Location: Railway Tracks
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Sacrificial Leap — An ally jumps to ensure Itsumi's safe departure and reunion. Characters: Masamune Kikuiri, Itsumi
Location: Freight Train
Escape and Echoes
A climactic chase during the Obon festival culminates in Saki's train departure. Years later, she returns to the deserted town, preserving memories of her past and the bond formed.
Key Events
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Sacrificial Leap — An ally jumps to ensure Itsumi's safe departure and reunion. Characters: Masamune Kikuiri, Itsumi
Location: Freight Train
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Saki's Departure — The train carrying Saki successfully leaves the isolated town. Characters: Masamune Kikuiri, Itsumi
Location: Railway Tracks
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Years Later Return — An adult Saki returns to the now deserted settlement. Characters: Masamune Kikuiri, Itsumi
Location: Mifuse Town
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Mill Remnants Visit — Saki explores the decaying industrial site of her past life. Characters: Masamune Kikuiri, Itsumi
Location: Steel Mill Ruins
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Farewell Messages Found — Preserved messages and memories of her previous existence are discovered. Characters: Masamune Kikuiri, Itsumi
Location: Mill Walls
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Eternal Memory Preserved — The past remains intact, honoring the bond and escape achieved. Characters: Masamune Kikuiri, Itsumi
Location: Steel Mill Ruins
A factory explosion plunges a small town into a timeless freeze, leaving teenage Masamune and his pals to grapple with a quickly collapsing reality.