Eiji Akaso
Nao Haie
Overview
Haie takes care of inheritance issues. He closes estate disputes and exposes questionable heirs — all while respecting the wishes of the dead.
Seasons
- Status
- Ended
- Seasons
- 1 season
- Episodes
- 10 episodes
- First aired
- Jan 25, 2025
Cast
8 people
Reviews
5 min readThe Lawyer Who Listened to the Dead
I’ve seen this trick before—the brilliant misfit who solves crimes by noticing what everyone else overlooks. Sherlock Holmes had his violin, Columbo his rumpled raincoat, and now Nao Haie, the inheritance detective, has his coffee beans. The first time we meet him, he’s standing in a half-empty Tokyo apartment, crunching them between his teeth like a man chewing over a particularly bitter truth.
The camera lingers on his fingers, stained with espresso oil, as he flips through a will that’s been torn in half. Not burned, not lost—torn. Someone didn’t want this found.
And that, right there, is the show’s first promise: the dead might not speak, but their paperwork does.
Inheritance Detective (2025) is a procedural that doesn’t care about corpses. Its mysteries begin where most end—after the funeral, when the real fighting starts. Haie, a former elite lawyer turned private investigator, specializes in the kind of cases that don’t make the news: the will that names a stranger, the heir who vanishes the day after the reading, the family business that’s suddenly worthless on paper.
His clients aren’t grieving widows or wronged siblings; they’re the people who stand to lose everything if the truth comes out. And Haie? He’s the hyena at the feast, circling the carcass of a fortune with a smirk and a subpoena.
The premise is clever, almost diabolically so. Inheritance law is the perfect playground for a detective story—full of arcane rules, emotional landmines, and the kind of greed that only surfaces when someone dies. But what makes Inheritance Detective more than just a gimmick is its refusal to treat these cases as mere puzzles.
The show understands that every contested will is a story about power, and every heir is a character in someone else’s tragedy. In one early episode, Haie uncovers a decades-old adoption that rewrites a family’s history. The reveal isn’t just a plot twist; it’s a gut punch, the kind that leaves the surviving relatives staring at each other like strangers.
(Which, of course, they are.)
Eiji Akaso plays Haie with a mix of swagger and exhaustion, like a man who’s seen too many people lie about their parents. His performance is the show’s secret weapon. He’s got the charisma of a leading man but the weariness of someone who’s been kicked out of every decent law firm in Tokyo.
Audience Opinions
Audience 7.2/10
"A clever but uneven inheritance mystery with a charismatic lead, though its cases lack depth and consistency."
The series draws praise for its sharp lead performance and the intriguing premise of a former lawyer turned inheritance detective, which offers a fresh twist on family secrets and legal drama. latestnetflix.com's view is that however, viewers note that the individual cases often feel disjointed, lacking the depth or surprise expected from a mystery series, and the supporting characters struggle to leave a lasting impression.
What viewers praise
- Charismatic lead Eiji Akaso’s portrayal of the former top lawyer turned detective is widely praised for its wit and charm.
- Fresh premise The inheritance-focused mystery angle stands out as a unique take on detective stories.
- Quirky allies The eclectic supporting cast adds humor and unpredictability to the cases.
Common complaints
- Disjointed cases Episodes often lack a strong narrative thread, making the mysteries feel scattered rather than cohesive.
- Shallow supporting cast Side characters fail to develop beyond their initial quirks, limiting emotional investment.
- Predictable outcomes Many cases resolve in ways that feel formulaic, reducing the element of surprise.
Recommended for
Legal drama enthusiasts Fans of lighthearted mysteries Eiji Akaso admirers Japanese crime drama lovers
Buzz & Rumors
Public reportsInside Inheritance Detective: The 2025 Japanese Mystery Series Blending Legal Drama and Dark Comedy
The Japanese drama Inheritance Detective (2025) is already turning heads before its premiere, promising a sharp mix of legal intrigue, family secrets, and a witty lead. Directed by Makoto Naganuma and Shintaro Sugawara, the 10-episode series follows a former lawyer turned investigator as he unravels inheritance disputes with a cynical edge. But what’s the real story behind the production? latestnetflix.com's take is that here’s what the early buzz reveals—and where the details get murky.
A Legal Thriller with a Twist: The Premise and Tone
Inheritance Detective isn’t your typical courtroom drama. The series centers on a protagonist who, after leaving the legal profession, becomes a private investigator specializing in inheritance cases—think wills, hidden assets, and family betrayals. The tone leans into dark comedy, with the lead’s sharp wit and moral ambiguity setting the stage for a series that blends mystery with biting humor 
.
The official tagline, "The Hyena Has Seven Lives," hints at the protagonist’s survivalist instincts, suggesting a character who thrives in the morally gray world of inheritance disputes. Sources describe the show as a mix of Detective Conan’s puzzle-solving and Legal High’s irreverent charm, with a focus on the seedy underbelly of family wealth .
The Creative Team: A Manga Adaptation with a Legal Edge
The series is based on a manga by Yumie Nishiogi and You Ikuta, with Nishiogi also penning the screenplay—a rare case of the original creator adapting their own work for the screen . This direct involvement could explain the show’s tight focus on legal minutiae, a hallmark of the source material.
Directors Makoto Naganuma and Shintaro Sugawara are no strangers to high-stakes storytelling. Naganuma has worked on crime dramas like MIU404, while Sugawara’s credits include Alice in Borderland, suggesting a knack for tension and character-driven narratives . Their collaboration here could mean a balance between procedural rigor and emotional depth.
Rumor (unconfirmed): A third director, Shigekatsu Honda, is also listed in some sources, but his role remains unclear . If true, this could signal a multi-director approach, common in Japanese anthology-style series but unusual for a single-season drama.
The Cast: A Mix of Rising Stars and Veteran Talent
Leading the ensemble is Eiji Akaso (Kamen Rider Zero-One, Alice in Borderland), who plays the former lawyer turned inheritance detective. Akaso’s recent roles in survival thrillers make him a strong fit for a protagonist navigating cutthroat family dynamics .
Supporting him is Hiyori Sakurada (The Naked Director), a rising star known for her versatility, and Yuma Yamoto (Rurouni Kenshin), who brings a mix of charm and intensity. Veteran actors like Masaya Katō (Battle Royale) and Kiyohiko Shibukawa (Drive My Car) round out the cast, adding gravitas to the series’ morally complex world 
.
Notable absence: While the cast is stacked, there’s no word yet on how the ensemble chemistry will play out on screen. Given the show’s darkly comedic tone, the interactions between Akaso’s cynical lead and the supporting players could be a major draw—or a potential weak spot if the humor falls flat.
Behind the Scenes: What We Know (and What We Don’t)
- Production Timeline: The series aired from January 25 to March 29, 2025, on NTV, Japan’s major commercial network. The 10-episode run suggests a tightly plotted mystery, possibly with a serialized arc .
- Genre Blending: The show’s tags—"Investigation," "Witty Male Lead," "Detective Fiction"—point to a hybrid of legal drama and noir, with a protagonist who’s more antihero than traditional detective .
- Manga Roots: The adaptation’s fidelity to the source material is unclear. Nishiogi’s dual role as manga creator and screenwriter could mean a faithful translation, but whether the series expands on the original’s cases remains to be seen .
What’s Missing?
- Budget and Scope: There’s no word on the production’s scale—whether it’s a modest TV drama or a high-budget prestige project.
- Reception: Early reviews or audience reactions aren’t available in the snippets, leaving the show’s quality an open question.
- International Plans: No confirmation on streaming availability outside Japan, though NTV’s global partnerships (e.g., with Netflix) could hint at future distribution.
**Why Inheritance Detective Could Be a Standout**
Japanese legal dramas often lean into either procedural realism (Legal High) or melodramatic family sagas (Mother). Inheritance Detective seems to carve its own niche by focusing on the intersection of law and greed, with a protagonist who’s more opportunist than idealist. If the tone lands, it could appeal to fans of Suits’ wit and The Night Of’s moral ambiguity.
The biggest wildcard? The humor. Dark comedy in Japanese dramas can be hit or miss, and the show’s success may hinge on whether Akaso’s lead can balance cynicism with likability. With a strong creative team and a premise ripe for twists, Inheritance Detective has the ingredients for a sleeper hit—if it avoids the pitfalls of overcomplicating its cases or underdeveloping its side characters.
For now, the mystery remains: Will this be the next big thing in Japanese TV, or just another legal drama lost in the shuffle? The answer arrives in 10 episodes—or, for international audiences, whenever (or if) it lands on streaming.
Entertainment rumors and trivia aggregated from public reporting. Treat speculation as unverified unless a cited source confirms it.