Detective Kyosuke Kozu's Murder Reasoning 5 (1986)
A switched suitcase, a blood-stained knife, and a family full of secrets — detective Kyosuke Kozu has a new case to crack.
Detective Kyosuke Kozu's Murder Reasoning 5 - Movie Information
- Original Title: 探偵神津恭介の殺人推理5
- Release Year: 1986
- Directed by: Yasutada Nagano
- Type: Movie
- Runtime: 1h 33m
- Original Language: Japanese
- Spoken Languages: Japanese
- Production Companies: Toei Company
- Production Countries: Japan
Detective Kyosuke Kozu's Murder Reasoning 5 - Plot
Newspaper reporter Kenzo let a strange woman Emi took taxi while on the way home from a business trip. Later, when he stopped by his girlfriend Nobuko's house to give her souvenir, he noticed that the suitcase had been replaced by Emi's. A knife with blood wiped out came out of Emi's trunk. Nobuko's older brother Kyosuke is a university professor, but he is also a famous detective. The next day, Kyosuke made Kenzo follow Emi's elder sister, Yuri, who came to exchange the trunk. Emi and Yuri are daughters of the landowner Kayama family, but they were both children of their ex-wife. His second wife, Shizue, has Miyako, another kid. Emi had a bad time with Shizue and left home, and she had just returned for the first time in three years...
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Detective Kyosuke Kozu's Murder Reasoning 5 - Cast & Crew
Director(s)
- Yasutada Nagano
Main Cast
- Masaomi Kondo
- Baku Ohwada
- Shun Hirooka
- Shiro Kishibe
- Rie Hiki
Writers
- Kikuma Shimoiizaka
- Akimitsu Takagi
Detective Kyosuke Kozu's Murder Reasoning 5 - FAQs
What is Detective Kyosuke Kozu's Murder Reasoning 5 about?
The film follows reporter Kenzo, who accidentally swaps luggage with a mysterious woman named Emi — only to find a blood-stained knife inside her trunk. Emi's brother Kyosuke, a professor and celebrated detective, steps in to unravel the dark secrets surrounding the wealthy, fractured Kayama family.
Is Detective Kyosuke Kozu's Murder Reasoning 5 part of a series?
Yes, it's the fifth installment in the Detective Kyosuke Kozu series, based on the mystery novels by Akimitsu Takagi. The franchise follows the brilliant detective Kyosuke Kozu across multiple cases, making this entry a continuation for fans already familiar with the character.
Is the film based on a novel by Akimitsu Takagi?
Yes, the film draws on the work of Akimitsu Takagi, one of Japan's most celebrated mystery writers. Takagi is credited as a writer on this entry, and his detective Kyosuke Kozu became a beloved figure in Japanese crime fiction, inspiring this long-running film series.
Who are the main actors in this film?
The cast features Masaomi Kondo, Baku Ohwada, Shun Hirooka, Shiro Kishibe, and Rie Hiki. These performers bring the intricate web of suspects and investigators to life across a story rooted in family conflict, hidden motives, and a carefully constructed mystery.
What makes the Kayama family central to the mystery?
The Kayama family is a wealthy landowning clan torn apart by a complicated family history. Emi and her sister Yuri are daughters of the patriarch's ex-wife, while his second wife Shizue has her own child. Long-standing tensions — and Emi's three-year absence — set the stage for the deadly events.
Who directed Detective Kyosuke Kozu's Murder Reasoning 5?
The film was directed by Yasutada Nagano. Working within the well-established framework of the Kyosuke Kozu series, Nagano crafts a compact, suspense-driven mystery that leans into the classic Japanese detective fiction tradition, keeping viewers guessing through a tightly woven plot.
How long is Detective Kyosuke Kozu's Murder Reasoning 5?
The film runs for 93 minutes — a brisk, focused runtime that suits the genre well. It wastes no time getting into the mystery, delivering a compact whodunit that moves efficiently from the inciting suitcase swap all the way through to Kyosuke's final deductions.
What are some similar films to watch after this one?
If you enjoy this film, you might like other Japanese mystery and detective titles such as A Man (2022), Museum (2016), and entries in the Detective Conan film series. For something different in tone, After the Storm (2016) and Before We Vanish (2017) also offer compelling Japanese storytelling.
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