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エリスの聖杯
12
TV
Finished Airing
Jan 8, 2026 to Mar 26, 2026
It is common knowledge that nobles will do anything for power; lying, manipulation, and extortion are the usual tactics. However, one family is exempt from this generalization: House Grail, whose main tenets are truth and integrity. The youngest daughter, Constance Grail, is just as moral as the rest of her family, believing in always doing the right thing and helping those in need. However, these ideals do not help her when her fiancé cheats on her with another woman. Framed by his lover in the hope of her downfall, Constance has no one to hear her pleas for justice. Everyone turns a blind eye, save for one—the spirit of the infamous Scarlett Castiel—who possesses Constance and turns the tables on her accuser. However, this aid does not come without a price. Ten years ago, Scarlett was executed for the attempted murder of Princess Cecilia. But this was actually a setup; as blunt and harsh as Scarlett could be, she would never stoop so low as to use poison. She has no idea who orchestrated her incrimination, but Scarlett demands that Constance—as the only one who can see her—help her exact revenge on all those who wronged her! [Written by MAL Rewrite]
7.4/10
Average Review Score
50%
Recommend It
10
Reviews Worldwide
I love this show, but Holy Grail of Eris has the rare distinction of suffering from a case of excessive world building. I’m all for fleshing out the world, characters and establishing mystery, but my God, if I need a damn flowchart to understand the show it’s probably gone too far. At one point, Scarlet literally makes a remark about how things have gotten too confusing to keep up with and it’s so funny because it’s a meta statement that perfectly sums up how everyone watching this show felt. Don’t get me wrong, Scarlet and Connie are one of the best duos of the seasonand I did enjoy the journey to solve the mystery behind Scarlet’s death, but I could’ve done with a little less lore dropping. Still, I think this is one of the better recent villainess shows. This has basically become the female equivalent of the isekai power fantasy set up or the banished from the hero’s party trope, but I’ll keep watching as many of these as they make. The distinguishing trait of Eris no Seihai is of course Scarlet and Constance’s unique relationship. Scarlet guiding Constance from beyond the grave and enlisting her help to solve her own murder isn’t something I’ve seen done before. They basically have a bad cop good cop dynamic going on and while Scarlet is definitely the older sister figure, after about the halfway point she’s the one being taught by Constance. Constance starts off as a weak timid low ranking noble who’s afraid to even stand up for herself and by the end of the show, she’s willing to stare down execution without blinking, facing off against criminal syndicates and generally being a much more assertive character who even moves scarlet consistently. It didn’t even dawn to me initially, put there’s a plot mechanic where Scarlet can take control of Constance’s body to help her through difficult situations and as the show goes on, it just happens less and less because Scarlet rubs off on Constance so much that she’s naturally able to deal with those situations on her own. It’s done so organically that I didn’t even realize until the end of the season that it had be several weeks since the last time it was done. I love when a character’s development is tangible and believable. It’s not just Constance, though. Even Scarlet gets a nice amount of development from beyond the grave and while she comes off as this pompous genius, we see the cracks in her armor and learn how that’s all just a facades a defensive mechanism to cope with all the pressure she’s had to deal with from the time she was a child. Both leads are very well written and likeable! Also a fan of how this series tackled some really dark and messed up topics like human trafficking, drug use, sexual assault etc., it didn’t shy away from the sort of things you could expect to see in a world with corrupt nobles which is refreshing. The supporting characters are where things kind of get messy. They’re all fairly well written, there’s just too many of them to keep up with and they all have these entangling alliances that feel like I’m learning about how WW1 started rather than watching an anime. Again, respect to the author for trying to make the world feel alive and lived in, but man this was a lot, especially the last 4-5 episodes when all the conspiracy and secret organization stuff started getting laid on thick. Cool ideas, but maybe a little less info dumping? I’m still kind of on the fence with the romance here. At first I hated it because Rudolph and Connie seemingly had no chemistry or anything in common, not to mention he’s quite a bit older than she is, I’m not quite sure of the ages because I haven’t read the books yet, but there’s a noticeable gap. However, it is an otome romance so you’ll always have some problematic elements. Generally, I think their relationship gets some solid development and by the end I was kind of .. rooting for them ngl. I think their relationship gets way Constance becomes someone Rudolph can lean on and he doesn’t have to always be the person coming to save her anymore is really sweet. Big fan of strong guys breaking down and showing the delicate soft girl character their weaknesses. It’s a relatively minor part of the story, the murder mystery and conspiracy stuff is way bigger so not a big deal either way. The production values are .. rough. The 2D art is good, but any extended action animation looks bad and tbh even some of the regular more laid back episodes looked rough. It’s an otome fantasy, so it doesn’t need the best quality, but still I would’ve liked a little better than this. The voice acting is amazing though. If you can stomach the subpar production values, I think holy grail of Eris is one of the better recent villainess series and certainly has one of the best stories. Convoluted, but a lot of thought went into this and it kept me engaged each week. Constance and Scarlet are also one of the best duos around, I’ll certainly miss scarlet on my screen each week! The holy Grail of Eris gets 8 out of 10
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The Verdict: A Mixed Bag of Visuals and Choppy Writing The Plot: A "Budget" Hack Job The story suffers from what can only be described as a loathsome "plot chop." The pacing feels rushed and disjointed, likely due to budget constraints or poor adaptation choices. It lacks the depth you’d expect from a solid series; honestly, if this had been a Chinese (CN) production, the execution likely would have been far more polished. The Art: The Main Attraction The art is the clear standout here. The character designs are specifically featuring a well-defined BBWC (big boobs with cleavage) aesthetic that doesn't miss. If you are here for thevisuals, the artist delivers, even if the writers didn't. Who is this for? The Target: This seems geared toward the "people at work" demographic looking for a quick, visually-driven distraction. The "Desire" Crowd: Anyone primarily motivated by the specific art style and character designs will likely enjoy this to the max. Who should skip it? If you are looking for a cohesive story featuring a villainess counterattack, genuine female friendship, and a strict no-romance (No CP) plot, this is a hard pass. Despite having the individual elements, it fails to weave them into a satisfying narrative. Bottom Line: It’s a series of "what ifs." BBWC trapped in a chopped-up story.
Pretty big disappointment for me. When it started out I absolutely loved it with the potential to be best of the season for me, but it got worse and worse over time. The plot got too convoluted. No more verbal beat downs by Scarlett, she just served as a deus ex machina to get the mc out of the stupid shit she constantly got herself into. And the promised revenge didn't feel like revenge at all with the perpetrators going completely scot-free or getting killed by third parties without the mc involvement. By the end I didn't care about any of them anymore, lots ofwasted potential. The other thing which is absolutely dogshit is forced relationship . The whole story isn't about revenge it's just a collection of tragic moments .
I watched this pretty much on autopilot, but the story never made much sense and they kept adding more characters and plot lines which I constantly felt like I wasn't following. By the time a character's scene would end was when I remembered vaguely who the character was. OP song had a pretty nice start, but overall wasn't memorable enough to put in any playlist. Art was decent, I don't recall any scene where I could judge the animation, mostly static conversation scenes. If there was animation, it was probably average considering I don't remember anything about it. Characters were pretty boring. Noone seemed to have a reasonablemotive for any of their actions except maybe the villains and Scarlet's Dad.
Ghost of a Dead Empire: The Holy Grail of Eris Review I swear that I will tell the truth, the whole truth, and nothing but the truth: I like this show more than The Apothecary Diaries. But-.....But!!.....BUT!!!!!!!! There is one huge, pulsating, festering BUT. I also hate it. I loathe it. I am watching a gem being tossed into a woodchipper in real-time. It is a mystery Villainess native-isekai that feels like a high-IQ twist based on genre naratives like Tearmoon Empire or The Most Heretical Last Boss Queen, but with a lethal edge. We follow a young noblewoman working with the ghost of a legendary Villainesswho was unlawfully beheaded. It's a ghost-detective thriller wrapped in a tight corset, and it should have been the anime of the year. THE GOOD 1. Assertiveness and Agency Let's start with the niceties, shall we? One of the best things about this show is that the MC duo actually has balls. They have absolute agency. They aren't shying away from trouble, they are hunting it. This makes a stark, refreshing contrast to the usual trash-tier subgenres—you know the ones: "Banned from the Hero Party so I'm going to have a slow life(and NGL the title are often BS too)" or "I am secretly the finest old fart with Ten Wenches" This show has spirit. It is astonishing what even amateur writers can achieve when they actually care about their characters. The chemistry is beautiful. Scarlet, the ghost, doesn't just give advice, she pushes, smacks, and literally electrocutes Conny when she starts getting wishy-washy. Scarlet drags the investigation—and the story itself—forward by the throat. It's a dynamic, aggressive partnership that refuses to let the plot stall, making the investigation feel earned rather than accidental. 2. A Persian Carpet of Character Complexity Next, the characters are actually diverse. They aren't just cardboard cutouts filling a background. Each one has their own ambitions, investments, and genuine agency in the story. Because the world is filled with so many moving parts, it is genuinely hard to guess who the mastermind is. It's incredibly satisfying to watch them support—or betray—each other, creating a complex mosaic of a jigsaw puzzle. And this doesn't just apply to the heroes. The villains are just as layered. One character that absolutely stood out was that pope-like religious leader. He is a walking contradiction: noble yet corrupt, perverted yet wise, bold, wicked, and obese, topped off with those ridiculous fake white wigs of the era. The best part? He is voiced by the legendary Fukuyama Jun —the same voice behind Lelouch, the Prince of Britannia himself. Classic. The show doesn't shy away from depicting reality. You see obese characters, scrawny ones, short ones, old, or middle aged—a whole spectrum of humanity. The world is dense and complex, with every character contributing their worth and weaving their lives—whether pure or morally bankrupt—into this grand, intricate Persian carpet of a narrative. 3. Historical Authenticity Over Fan Service Thirdly, while the character designs and art style are mediocre at best—and the actions are just meh—the backgrounds are actually convincing. The clothes and props are where this show really shines. The attire worn by characters like Scarlet reflects specific historical fashion trends rather than being purely for modern appeal. In various periods of European history, such as the Renaissance and the Baroque era, the silhouettes for noblewomen often featured lower necklines along with corsets as a sign of status and fashion, influenced by the French noblewoman, Agnès Sorel. These styles were considered high fashion at the time and were distinct from the more modest daytime dress codes that emerged in later centuries. It is written that Agnès Sorel, Dame de Beauté, or the Lady of Beauty, wore square-cut dresses with diamond accessories to display both her purity and the King’s favor at the French court. This striking look sent waves of shock across European courts, and the fashion caught on, lasting nearly 500 years. By the 19th century, it became obsolete for daytime wear, as more modest styles took over, but evening attire, at night balls and banquets, continued to showcase a woman’s wellbeing, upbringing, wealth, and elegant bodice. This tradition persists today, when Hollywood celebrities walk the red carpet, revealing—or rather celebrating—their beauty for the world to see. It’s also worth noting how the show captures this specific historical contrast: while lower necklines were acceptable in formal or courtly settings, showing legs or ankles was often considered inappropriate. The use of long, voluminous skirts aligns with the social etiquette of those eras. By incorporating these elements, the production demonstrates an attention to historical garment construction that sets it apart from other series in the genre. 4. A Narrative with Real Architecture Fourth, it has a killer twist. I was genuinely surprised to find that the show actually has an intentional structure. While I won't spoil it, this isn't just some trash work written on a whim with no thought for its own plot. It feels like the entire roadmap was worked out from the very beginning, and everything ties up nicely in the end. It's rare to find a show in this genre that doesn't just meander or make things up as it goes. Here, every thread eventually leads somewhere, proving that there was a master plan behind the mystery all along. THE BAD A Script Made of Pure Manure. The bad part is how it has a super rushed, super cut-up, sloppy script—an unbelievable piece of excrement. The script is pure Feces. Manure. Cacapoopoo. This kind of adaptation is frustrating to the point of making the medium, the entire industry look bad. It feels like watching a show designed for someone with a three-second attention span. This is not a normal film. It simply does not qualify as one. You could watch a long-running battle shonen—like Dragon Ball Z—(I know they had issues back then and had to produce it under insane industry constraints, but facts are facts)-at three times the speed and it might work because of the filler, but that approach is a disaster for a complex mystery. There are approximately 30 characters in this show, and they rotate in and out constantly. Their connections are intricate, often involving multiple facets that make them difficult to track. There is absolutely no breathing space to process the plot. It’s like playing a rated chess game at the professional level while running a marathon. It is a frantic, disorganized goo that deserves a failing grade. Frankly, [F] is for Fuck this anime. Why would a studio invest in quality animation (The first 30 seconds of the opening are creative, and I genuinely love it. I’m sure whoever directed it loved it too and gave it their all) only to throw it away with such poor direction? Why find a standout story in the Isekai pile and then rush through it at triple speed? It is a waste of resources, a waste of talent, and a disservice to the original author. It damages the studio's reputation and contributes to the exhaustion of the medium. The constant chopping of a solid manuscript into this hollow version of the story is truly disappointing. I get it. I really do. I understand, and I sympathize with the director. They shouldn't be crucified as the villain here. The call didn't come from the director or the series composition. They did what they could, within their limits, to make the show work. Same goes for the lead writer. So who made the call? Who decided on the 12-episode slot? The producers. The originators. The production committee. The whole machine. And that... isn't something I can fight. So in the end, it really is take it or leave it. As bitter as that sounds. THE UGLY To wrap this up, look at the cold, hard numbers. This is the Mystery/suspense Anime Adaptation Density List. The math is simple: More episodes per volume = Slower/Detailed. Fewer episodes = Sped up/Rushed. In/Spectre (s1)(Feature) 12 ep/1 vol = 12 eps per vol The Apothecary Diaries (Short Stories) 24 ep/2 vol = 12 eps per vol Bakemonogatari (SS/Dialogue) 7.5 eps per vol Raven of the Inner Palace (SS) 6.5 eps per vol Ascendance of a Bookworm (s2) 6 eps per vol Hyouka (Short Stories) 5.5 eps per vol Shoshimin Series (Short Stories) 5 eps per vol Bookworm (s1/s3) 4.9 eps per vol Monster (Epic Feature) 4.1 eps per vol (75ep÷18vol) Unnamed Memory 4 eps per vol Case Files of Arne (Short Stories) 4 eps per vol Kamonohashi Ron (s1) (Short Stories) 3.5 eps per vol The Holy Grail of Eris 3 eps per vol Gosick (Short Stories) 2.6 eps per vol The numbers don't lie. Trying to shove a dense, 4-volume mystery into 12 episodes is suicide. You end up with 3 episodes per volume—a breakneck pace that kills the complexity and leaves the audience suffocating. It's a tragedy that a gem with so much historical authenticity and character agency gets buried under a script that moves at the speed of a TikTok reel. I… I don't even know how to put this into words. English doesn’t have the right vocabulary for this level of frustration. It just won’t come out… It’s beyond sad. It’s bitter. If the industry keeps up this kind of "good" work, its demise is 100% inevitable. I can see it now—20 or 30 years from today, some old-timer on 4chan or Reddit will take a depressing sip of whisky and sigh, "Yeah, those were the days. Anime used to be great". But everyone else? They’ll have moved on to better things, like Donghua. Japan will fall from grace, trapped in a loop of making these insular, hollow isekais and villainess "clips" that nobody cares about. It’ll just be a handful of people left in Japan, watching their own shrinking medium and dreaming about the "glory days" of a dead empire.