Eris no Seihai

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]

Castiel, Scarlett Main

Suzushiro, Sayumi Japanese

Grail, Constance Main

Ichinose, Kana Japanese

Miriam Supporting

Kayano, Ai Japanese

San Supporting

Touyama, Nao Japanese

Ulster, Randolph Supporting

Azakami, Youhei Japanese

O'Brian, Abigail Supporting

Kawasumi, Ayako Japanese

Castiel, Adolphus Supporting

Toriumi, Kousuke Japanese

Rebecca Supporting

Kondou, Reina Japanese

Spencer, Sharon Supporting

Hayama, Ikumi Japanese

O'Brian, Lucia Supporting

Inui, Natsune Japanese

Oowada, Tomoyuki Producer

Ozawa, Fumihiro Producer

Oonuki, Yuusuke Producer

Fukao, Satoshi Producer

Reviews

Mar 26, 2026

Marinate1016

Recommended

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 season ... and 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

Reviewer’s Rating: 8

What did you think of this review?

Nice 0

Love it 0

Funny 0

Confusing 0

Informative 0

Well-written 0

Creative 0

More reviews by Marinate1016 (496)

Show all

Read more

Show less

Open

Gift

Report

Mar 28, 2026

researchscum

Mixed Feelings

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 the ... visuals, 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.

Reviewer’s Rating: 7

What did you think of this review?

Nice 0

Love it 0

Funny 0

Confusing 0

Informative 0

Well-written 0

Creative 0

More reviews by researchscum (1)

Show all

Read more

Show less

Open

Gift

Report

Mar 28, 2026

HERMIT_PAIMON

Not Recommended

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 of ... wasted 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 .

Reviewer’s Rating: 5

What did you think of this review?

Nice 0

Love it 0

Funny 0

Confusing 0

Informative 0

Well-written 0

Creative 0

More reviews by HERMIT_PAIMON (126)

Show all

Read more

Show less

Open

Gift

Report

Shousetsuka ni Narou anime adaptation, Part 6

by AkeZZZ

50 Entries · 43 Restacks

Villainess/Otome theme Anime

by ZXEAN

38 Entries · 385 Restacks

2nd Chance? A New World? - isekai and similar genres (SHOUJO BASED PART 2)

by Pumpkin_Season

12 Entries · 3 Restacks

Winter 2026 Simulcast List [Update 1/17]

In this thread, you'll find a comprehensive list of television anime acquired for simulcast release during the Winter 2026 season. Anime series licensed for hom...read more

Dec 30, 2025 2:40 PM by Snow | Discuss (15 comments)

Winter 2026 Preview

In this thread, you'll find a comprehensive list of Winter 2026 titles with an accompanying promotional video, commercial, teaser, or trailer. This post will be...read more

Dec 19, 2025 7:10 AM by Snow | Discuss (4 comments)

	Poll: Eris no Seihai Episode 5 Discussion ( 1 2 ) Stark700 - Feb 5	50 replies	by Miyu-Miyuri »» 9 hours ago
	Poll: Eris no Seihai Episode 9 Discussion Stark700 - Mar 5	44 replies	by Ereru »» Yesterday, 3:51 AM
	Opinion for those who read Light Novel (source) or Manga (adaptation) Sleeping_Knight - Feb 15	14 replies	by Ereru »» Yesterday, 3:11 AM
	Poll: Eris no Seihai Episode 12 Discussion Stark700 - Mar 26	48 replies	by CottonModem »» Yesterday, 1:33 AM
	Poll: Eris no Seihai Episode 6 Discussion Stark700 - Feb 12	31 replies	by Rimuru7s »» Mar 28, 5:16 PM