Fukakutei Sekai no Tantei Shinshi Returns September 10 on Switch and PS4 With New Opening Movie

MAGES. is bringing Fukakutei Sekai no Tantei Shinshi: Agyou Souma no Jiken File (不確定世界の探偵紳士～悪行双麻の事件ファイル～) back to modern platforms. The hardboiled mystery adventure created by Hiroyuki Kanno launches on September 10, 2026 for Nintendo Switch and PlayStation 4.

The new release once again follows Class A detective Agyou Souma through a collection of unusual investigations, while adding a newly produced opening movie for the Switch and PS4 port. MAGES. is also running a launch sale through the end of September.

Quick Summary

• Romanized title: Fukakutei Sekai no Tantei Shinshi: Agyou Souma no Jiken File
• Japanese title: 不確定世界の探偵紳士～悪行双麻の事件ファイル～
• Series: Tantei Shinshi
• Series position: first entry in the Tantei Shinshi series
• Creator: Hiroyuki Kanno
• 2026 publisher: MAGES.
• Official genre: full-scale mystery adventure
• Platforms: Nintendo Switch and PlayStation 4
• Release date: September 10, 2026
• Distribution: download-only
• Regular price: ¥2,970 including tax
• Launch-sale price: ¥1,990
• Sale period: September 10–30, 2026
• Nintendo Switch sale: available during the announced period
• PS4 sale: limited to PlayStation Plus members
• Language: Japanese
• Japanese rating: CERO C, ages 15 and up
• IARC rating: 16+
• Original release: PC in 2000
• Previous console version: released in 2009
• New 2026 addition: newly produced opening movie
• Protagonist: Agyou Souma
• Occupation: private detective
• Organization: IDLA
• License: Class A Detective
• Class A detectives in Japan according to the story: only two
• Class A detectives worldwide according to his profile: roughly 30
• Major character: Mint Mitsurugi
• Mint: autonomous android known as a May-Droid
• Maiko Ayaki: lawyer and IDLA liaison
• Mayumi Misaragi: client searching for her missing husband
• Ash: bartender and information broker
• Miyuki Nanjo: Class C detective at Shiawase Detective Agency
• Investigation mechanic: Proof Target System
• Investigation actions: observe/examine, talk, touch and move
• Time mechanic: Time Limit System
• Time progression: affected by movement and actions
• Case rewards: influenced by completion speed
• Paid information: can be purchased from an information broker
• Field Note: visually tracks investigation progress
• Parallel cases: multiple jobs can be investigated at once
• Connection to Mystereet: set one year before Mystereet
• Latest Mystereet release: published by MAGES. in July 2025

Opening Movie, Nintendo Switch and Gameplay

Hiroyuki Kanno's Mystery Adventure Returns to Modern Platforms

Fukakutei Sekai no Tantei Shinshi is the starting point of the Tantei Shinshi series, one of Hiroyuki Kanno's mystery-adventure works. The original PC game launched in 2000 before a console edition followed in 2009.

The 2026 port makes the title readily available again on currently supported hardware. MAGES. is releasing it for Nintendo Switch and PlayStation 4, although no physical edition has been announced; both versions are digital-only.

The story also connects directly with Mystereet: Yasogami Kaoru no Chousen, as Fukakutei Sekai no Tantei Shinshi takes place one year earlier.

Agyou Souma Is One of the World's Rare Class A Detectives

Players step into the role of Agyou Souma, a detective affiliated with the international organization IDLA.

He holds the extremely rare Class A license. His official profile says only around 30 detectives in the world have reached that rank, with just two operating in Japan.

Despite his ability, Souma keeps an unmarked office in the backstreet area known as Kuzu-dori. He is also burdened with extraordinary “bad luck,” to the point that trouble and difficult cases seem to gather around him on their own.

The Proof Target System Makes Investigation More Active

Investigation goes beyond conventional dialogue selections. The Proof Target System lets players focus on objects and characters on screen before choosing how to interact with them.

Options include observing or examining targets, speaking to people, touching particular objects and moving to different locations. Thorough investigation can reveal new targets and additional information.

The structure encourages players to inspect scenes carefully instead of simply advancing through an entirely linear chain of conversations.

Time and Money Affect How Cases Are Solved

Fukakutei Sekai no Tantei Shinshi also uses a Time Limit System. Individual jobs have preferred completion windows, while moving between places causes time to pass.

Solving cases quickly can produce higher rewards. Passing the preferred deadline reduces payment, which in turn can make it harder to purchase useful information.

Information brokers sell leads at different prices, with more expensive information generally carrying greater value. Players must decide when a lead is worth paying for and when their funds should be conserved.

Three Highlighted Cases Show the Range of Its Mysteries

The official material introduces several jobs assigned to Souma. The Ghost Murder Case begins with reports of a ghost at a beach before escalating into the discovery of a decapitated body.

Another case asks Souma to locate a husband who disappeared during his honeymoon despite remarkably little information being available about his appearance or background.

A third job has him protecting Mint Mitsurugi, a human-like autonomous android who eventually begins living with him. Their relationship pushes the story toward questions of humanity and affection beyond straightforward criminal investigation.

These are not the only cases available. Additional requests emerge as the story progresses, and multiple investigations can run simultaneously.

A New Opening Movie Was Produced for the 2026 Port

The clearest newly announced addition for the Switch and PS4 versions is a newly produced opening movie.

The video uses an energetic soundtrack to reintroduce Souma's hardboiled world, the people surrounding him and the atmosphere of the investigations he accepts.

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Because the movie was created specifically for the modern port, it is also the most relevant new footage for seeing how MAGES. is presenting the more than two-decade-old adventure to a 2026 audience.

Launch Sale Drops the Price to ¥1,990

The regular price is ¥2,970 including tax.

From September 10 through September 30, 2026, the Nintendo eShop and PlayStation Store will offer the game for ¥1,990. MAGES. describes the promotion as roughly 30% off.

There is one important platform distinction: the PlayStation 4 sale is available only to PlayStation Plus members, while no equivalent membership condition is listed for the Switch version.

Why This Matters

1) A Hiroyuki Kanno mystery adventure becomes readily available again

A game originating in 2000 can now be played on Switch and PS4 without depending on older hardware.

2) Investigation combines time and economic pressure

Finding evidence is only part of the process; players also manage deadlines, rewards and the cost of purchasing useful information.

3) It serves as an entry point before Mystereet

The story is set one year before Mystereet, giving modern players a clearer starting point for the Tantei Shinshi chronology.

4) The port includes newly created material

The opening movie was made specifically for the new release rather than the project functioning purely as an unchanged software transfer.

Game Information

For now, the additional important information currently known includes:

• Fukakutei Sekai no Tantei Shinshi: Agyou Souma no Jiken File launches on September 10, 2026
• the announced platforms are Nintendo Switch and PlayStation 4
• the game is distributed only as a digital download
• the regular price is ¥2,970 including tax
• the launch sale lowers the price to ¥1,990
• the promotion runs from September 10 through September 30, 2026
• the PS4 discount is limited to PlayStation Plus members
• MAGES. advises customers to confirm the displayed store price before purchase
• the officially listed language is Japanese
• the Japanese rating is CERO C
• the IARC rating is 16+
• MAGES. publishes the 2026 edition
• its official genre is full-scale mystery adventure
• the original work was created by Hiroyuki Kanno
• the original PC edition dates back to 2000
• a previous console version appeared in 2009
• a new opening movie was produced for the Switch and PS4 port
• Agyou Souma is a detective affiliated with IDLA
• Souma holds a Class A license
• his official profile states that only around 30 Class A detectives exist worldwide
• the setting says only two Class A detectives operate in Japan
• the Proof Target System is used to investigate characters and objects
• actions include observing, examining, talking, touching and changing locations
• deeper inspection can expose additional targets
• the Time Limit System connects movement and investigation with the passage of time
• jobs have preferred completion periods
• finishing faster can increase case rewards
• rewards decrease when the preferred deadline is exceeded
• money can be spent to purchase information
• the value of information offered by brokers varies with its price
• phone numbers collected during investigations can be used from the detective office
• Field Note provides a visual overview of case progress
• several cases can be investigated in parallel
• Ghost Murder Case is one of the officially introduced cases
• Search for the Invisible Husband is another highlighted investigation
• Mint Mitsurugi Escort Request is also among the featured jobs
• Mint Mitsurugi is a human-like May-Droid
• the game is set one year before Mystereet: Yasogami Kaoru no Chousen
• the official site also provides guidelines for gameplay videos and streaming
• official game information is available through the Fukakutei Sekai no Tantei Shinshi Official Website
• the release announcement is available through the MAGES. GAME Official X Post
• the new opening movie is available through the MAGES. Official Opening Movie
• the Nintendo Switch listing is available through the Nintendo eShop
• publisher information is available through MAGES. GAME

Closing

Fukakutei Sekai no Tantei Shinshi: Agyou Souma no Jiken File brings the beginning of the Tantei Shinshi series back with an investigation system built around observation, time management, information costs and several cases that can overlap. The newly produced opening movie gives the 2026 port its clearest piece of fresh presentation.

The game launches digitally on September 10, 2026 for Nintendo Switch and PlayStation 4. No physical version, non-Japanese language support or additional modern platforms have been announced for this release.