Plot Analysis Summary
A detective's information-system trial leads into a fish-related investigation, while his connection with Natsuro raises intimate questions about life, freedom, and departure.
Story Structure — 4 Plot Phases
A Fish and a New System
A birthday fish's illness prompts a question about human decay. Poo meets Delta Works, accepts an F-Series trial, and Natsuro helps him use it.
Key Events
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Birthday Fish Gift — A young person receives a fish and hopes it will become a super-red dragonfish.
Location: Unspecified
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Fish Falls Ill — The fish's illness and decay prompt reflection on human mortality.
Location: Unspecified
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Poo Meets Delta Works — The company introduces its information system to private detective Poo. Characters: Poo Rinwon, Delta Works Japan Sales Manager
Location: Delta Works
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Free System Trial — Poo accepts a free trial, and Natsuro helps him operate the equipment. Characters: Poo Rinwon, Natsuro
Location: Unspecified
Searching for Tobiyama
The system points Poo and Natsuro toward Tobiyama and also surfaces information about Thomas Erwing. Their search reveals the difference between an ordinary silver dragonfish and a rare protected super-red fish.
Key Events
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Tobiyama Search Begins — The system leads the pair toward Tobiyama and his search for a dragonfish. Characters: Poo Rinwon, Natsuro, Tetsu Tobiyama
Location: Unspecified
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Erwing Database Result — A database search surfaces information about the dangerous criminal Thomas Erwing. Characters: Poo Rinwon, Natsuro, Thomas Erwing
Location: Unspecified
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Confidential Series Question — The search raises questions about Delta Works' confidential TS Series. Characters: Poo Rinwon, Natsuro
Location: Unspecified
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Dragonfish Value Revealed — The investigation distinguishes Tobiyama's claimed silver dragonfish from the rare, protected super-red variety. Characters: Poo Rinwon, Natsuro, Tetsu Tobiyama
Location: Unspecified
Trails and Hidden Data
Poo and Natsuro trace Tobiyama's fish-food purchases and question whether the visible trails are deliberate misdirection. Their work becomes entangled with company secrets and police attention, while Poo trains with a gun.
Key Events
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Fish Food Purchases Traced — Poo and Natsuro trace Tobiyama's purchases across numerous stores. Characters: Poo Rinwon, Natsuro, Tetsu Tobiyama
Location: Fish-food stores
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Visible Trail Questioned — They suspect Tobiyama's many visible trails may be deliberate misdirection. Characters: Poo Rinwon, Natsuro, Tetsu Tobiyama
Location: Unspecified
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Poo Trains With Gun — Poo trains with a gun as the investigation develops. Characters: Poo Rinwon
Location: Unspecified
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Company Data Entanglement — Their work grows entangled with the company's secret data and police attention. Characters: Poo Rinwon, Natsuro
Location: Unspecified
An Unfinished Farewell
Away from the investigation, Poo and Natsuro discuss fish, life, and death, and Poo invites Natsuro to see the sea. Natsuro cannot leave freely; after police question him, he is taken away, leaving an exchange and their plans unresolved.
Key Events
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Fish and Mortality Talk — Natsuro visits Poo, whose tropical fish and conversation prompt reflections on life and death. Characters: Poo Rinwon, Natsuro
Location: Poo's home
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Invitation to the Sea — Poo invites Natsuro to see the sea, but Natsuro says he cannot leave without permission. Characters: Poo Rinwon, Natsuro
Location: Poo's home
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Police Question Natsuro — Police arrive to question Natsuro, and his protector appears that night to take him away. Characters: Natsuro
Location: Unspecified
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Parting Exchange — Natsuro returns with something Poo wanted, tells him to have it, and leaves the plans unresolved. Characters: Poo Rinwon, Natsuro
Location: Unspecified