Story Structure — 5 Plot Phases
Fateful Descent
The narrative opens with synchronized death predictions that shatter ordinary reality. Both protagonists are forcibly integrated into a clandestine defense organization, learning to wield demonic avatars under strict institutional oversight. Their initial compliance masks growing unease about predetermined outcomes and ethical compromises.
Key Events
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Death Clip Revelation — The duo receives synchronized death predictions via Nicaea, establishing the inciting incident that traps them in a predetermined timeline. Characters: Daichi Shijima, Hibiki Kuze
Location: Train Station
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JP's Underground Induction — Arrested and brought to a secret facility, they learn about paranormal anomalies and their unique demon avatars under JP's authority. Characters: Daichi Shijima, Hibiki Kuze
Location: National Diet Building
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Breakfast Truce — A rare moment of domestic normalcy allows the duo to process trauma and reinforce interpersonal bonds before major battles. Characters: Daichi Shijima, Hibiki Kuze
Location: Safe House Kitchen
Fractured Loyalties
Operational failures and external hacking expose systemic vulnerabilities, pushing the duo toward independent action. Strategic disagreements over command methodologies create temporary rifts, yet shared combat experiences gradually realign their priorities. The emergence of rogue factions forces a clear division between institutional control and grassroots resistance.
Key Events
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Osaka Mercenary Hunt — Deployed to locate missing scientists, they encounter hostile summoners and face initial combat challenges against external threats. Characters: Daichi Shijima, Hibiki Kuze
Location: Osaka City
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Data Center Breach — An external hacker reroutes identities, exposing systemic vulnerabilities and forcing the duo into defensive operational modes. Characters: Daichi Shijima, Hibiki Kuze
Location: Osaka Headquarters
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Merak Manifestation — Military forces fail to contain the entity, leading to barrier collapse and forcing the protagonists into direct confrontation. Characters: Daichi Shijima, Hibiki Kuze
Location: Shin Juso Ohashi Bridge
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Nagoya Infiltration Resolve — Upon receiving a fabricated death clip for Hibiki, Daichi and allies secretly board transport to intercept the predicted event. Characters: Daichi Shijima, Hibiki Kuze
Location: Train Line
Shadows of Trust
Cautious alliances form around enigmatic figures who challenge established power structures. Domestic interludes provide brief respite from escalating supernatural threats, allowing interpersonal bonds to stabilize. Intelligence gathering reveals deeper conspiracies, shifting focus from survival to ideological defiance.
Key Events
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Methodological Clash — Debates erupt over JP's rigid protocols versus resistance flexibility, highlighting ideological fractures within the summoner ranks. Characters: Daichi Shijima, Hibiki Kuze
Location: Nagoya TV Tower
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Alcor Sanctuary Pact — Hibiki grants refuge to the enigmatic Alcor, fostering cautious trust while Daichi processes the implications of hidden agendas. Characters: Daichi Shijima, Hibiki Kuze
Location: JP's Quarters
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Resistance Formation — Formal splits occur between institutional loyalty and grassroots survival, cementing the protagonists' independent operational path. Characters: Daichi Shijima, Hibiki Kuze
Location: Nagoya Branch
Trials of Polaris
Adaptive demonic entities introduce unprecedented tactical challenges, demanding rapid innovation in summoner deployment. Concealed fate predictions strain group cohesion, prompting difficult conversations about sacrifice and agency. Philosophical debates crystallize around the core theme of free will versus predetermined destiny.
Key Events
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Megrez Regeneration Crisis — The trio faces an endlessly healing foe, forcing tactical adaptation and exposing the limits of conventional summoner warfare. Characters: Daichi Shijima, Hibiki Kuze
Location: Multi-City Fronts
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Io's Fate Withholding — Concerns mount over Mizar's replication capabilities as Io conceals her own death prediction, straining group dynamics. Characters: Daichi Shijima, Hibiki Kuze
Location: JP's Briefing Room
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Hospital Recovery Phase — Hibiki enters intensive care following battle injuries, prompting Daichi to assume greater responsibility for team morale and strategy. Characters: Daichi Shijima, Hibiki Kuze
Location: JP's Tokyo Branch
Realization & Climax
Converging fronts force a decisive confrontation at the city's highest point. Moral frameworks are rigorously tested as institutional leaders clash with resistance ideals. Coordinated strikes and philosophical resolutions culminate in a definitive stand that redefines the protagonists' role in shaping humanity's trajectory.
Key Events
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Hospital Recovery Phase — Hibiki enters intensive care following battle injuries, prompting Daichi to assume greater responsibility for team morale and strategy. Characters: Daichi Shijima, Hibiki Kuze
Location: JP's Tokyo Branch
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Botis Skirmish — Hostile demons attack Alcor's sanctuary, demonstrating shifting political alignments and escalating supernatural volatility. Characters: Daichi Shijima, Hibiki Kuze
Location: Quarters Perimeter
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Polaris Trials Debate — Philosophical arguments intensify regarding predetermined outcomes versus human agency, setting the stage for final confrontations. Characters: Daichi Shijima, Hibiki Kuze
Location: Tokyo Tower Approach
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Yamato Convergence — Direct clashes erupt as Yamato draws opponents toward the tower apex, leveraging environmental advantages to enforce his vision. Characters: Daichi Shijima, Hibiki Kuze
Location: Tokyo Tower Summit
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Humanity Questioned — Yamato challenges Hibiki's moral reasoning, forcing a reckoning over what it means to preserve humanity amidst sacrifice. Characters: Daichi Shijima, Hibiki Kuze
Location: Tower Interior
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Final Barrier Stand — The ultimate defensive push culminates in coordinated strikes that challenge the antagonist's deterministic framework. Characters: Daichi Shijima, Hibiki Kuze
Location: Tokyo Tower Apex
The countdown to extinction begins on Sunday with the arrival of the Septentriones, otherworldly invaders set on the eradication of mankind. Caught in the crossfire, Hibiki Kuze and his friends join in the war for humanity's survival by signing contracts with demons to become "Devil Summoners." Soon, their abilities attract the attention of JP's, an underground agency led by Yamato Houtsuin. Once recruited into JP's, Hibiki and his friends fight and bond alongside other ordinary citizens who are Devil Summoners.
However, with each new day, another Septentrione appears to wreak havoc upon Japan. Even if many lives are lost in the process, before that night ends, the young summoners must defeat the invaders at all costs.