I will be honest with you: I came into this one with genuine excitement. I’ve always had a soft spot for vampire stories. Vampires have held a special place in my heart since I was a young teen reading Vampire Academy and binging Hellsing. Plus, the promise of a reverse harem set in a world where vampires and werewolves actually hate each other? That sounded like exactly the kind of indulgent watch I needed. I hoped the anime would be a proper chance to sink my teeth into a camp vampire romance similar to Diabolik Lovers. I was craving that.
What I got instead was a campy teen romance with a sprinkle of vampire. It’s not that the show is broken. It does what it sets out to do, mostly. It’s that what it sets out to do isn’t quite what it advertises on the tin.
I watched the full 12 episodes in English dub, and yeah, the occasional slang and accents threw me a bit (British family influence, sorry). It was a mixed bag that left me more frustrated than satisfied, but I still found bits to enjoy.
The opening song has been sitting in my playlist since episode 1, though. I’ll give it that.
Bite into the review
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Quick review
- Humour: Light and incidental; the occasional comedic moment lands, but it’s never the point.
- Tone: Soft paranormal romance with a school-drama heartbeat.
- Characters: Visually distinct designs, but most of them barely get to speak.
- Romance: Skewed love triangle dressed up as a reverse harem.
- Vibe: Easy weekend binge for fans of pretty boys and soft supernatural vibes; best with snacks and low expectations.
What is Dark Moon: The Blood Altar about?
- Full genre list: Fantasy, romance, supernatural, reverse harem, school, vampire
- Key themes: Prejudice and belonging, the weight of a painful past, found family abd hidden identities
- Type: Series
- Episodes: 12
- Duration to watch in full: +/- 4 hours 30 minutes
- Age restriction: 13+
- Trigger warnings: Mild-violence, blood, references to the death of a childhood friend, supernatural threat, discrimination
- Release date: January 2026
- Animation studio: TROYCA
- English dub: Yes
- Source: Manhwa/webtoon
- Kanji: 黒の月: 月の祭壇
- Alternative title: Kuro no Tsuki: Tsuki no Saidan;
- Average Rating: 6.6/10
- Stream: Crunchyroll and BiliBili
- Does the story continue in the source material? Yes
- Official website
- Official hashtags: DARKMOON #黒の月 #DARKMOON_TBA #DarkMoonTheBloodAltar
Sooha is a girl with a secret she has spent years hiding: she has inhuman strength, and in a world where vampires exist, that kind of thing gets you accused of being one. After a tragedy tied to her childhood, she transfers to Decelis Academy, a prestigious night school that is supposed to be off-limits to supernatural beings. What she does not know is that the seven most popular boys at the school are vampires, hiding in plain sight.
My thoughts on Dark Moon: The Blood Altar
I really wanted to love this. The premise had everything I enjoy: vampires at school, rival werewolf packs, a mysterious girl with her own powers, and that classic “hiding in plain sight” tension. Let me start with what works, because there are things that genuinely work here.
The animation is clean and stylish. The first couple of episodes hooked me with the setup and the flashy character designs. Troyca gave the character designs room to breathe on screen, and the distinct visual identities for each boy mean you actually always know who is who, which matters enormously in a cast this large.
The colour palette is moody without being oppressive, and the early episodes carry a decent sense of atmosphere for the school setting. The opening sequence is properly well done, the song especially, which I’ve listened to completely outside of the actual watching experience and would do so again without any guilt.
The ending animation also caught me off guard in a good way. There’s a sweetness to it that the main show sometimes forgets to have.
Now. The rest.
The problem with Dark Moon: The Blood Altar is not that it’s a reverse harem. I’m a reverse harem reader and watcher. I know the genre, and I have genuine affection for it. The problem is that the harem setup quietly collapses about midway through and becomes a love triangle with one of the angles so dominant it’s barely even a triangle. It’s more of a couple with a bystander.
The whole ensemble promise of a reverse harem only works when there’s actual tension about the direction the story is heading. Here, the direction is clear from the first time Heli appears on screen. Even before he meets Sooha. That takes a significant amount of energy out of what should have been part of the driving tension.
The cast is also too large for 12 episodes to meaningfully support. Some of the boys are genuinely charming in the brief moments they’re allowed, but the screen time is spread so thinly that most of them register primarily as faces and colour associations rather than characters. The werewolves get it even worse.
They’re introduced, they contribute atmosphere and the welcome tension of a genuine inter-species grudge, and then they’re mostly decorative. Which is a waste, honestly. Which is ironic since I found myself latching onto the werewolf characters more, especially Khan and Solon, funny how the non-vampires stole scenes in a vampire story.
The longer it went on, the more it felt like the supernatural elements were just window dressing for a very safe teen romance. It also became clearer to me as the series went on: these vampires could, with very little effort, have been rewritten as mages, and nothing about the plot would need to change. The vampire identity doesn’t do meaningful work with the main cast. It doesn’t aptly shape how the boys relate to each other, doesn’t create any real danger for the viewer, and doesn’t give the story its texture in the way good supernatural worldbuilding should. What we’re left with is attractive young men who happen to have niche superpowers.
The fangs are, for lack of a better word, cosmetic on the main cast. The ‘bad’ vampires make for decent vampires, and I am happy enough with them. That bothered me more than it probably should.
The pacing doesn’t help any of this. The first two or three episodes do their job of setting the scene, and there’s enough happening that I kept hoping momentum would build. It doesn’t, really. The story advances, yes, but at its own comfortable pace, which is a polite way of saying it plods. Episodes would finish, and I’d check how many were left with the quiet hope that something would shift.
The finale leans into something almost delightfully over-the-top; there’s a stretch near the end that has proper transformation energy, and I mean that as a compliment, but it gets there by pulling a narrative rabbit out of a hat in a way that feels more like convenience than payoff.
The conclusion is as safe as conclusions get. Bonds triumph. The villain is defeated. Sooha has a key moment. It’s fine. It’s just very, very safe.
Overall Enjoyment and Personal Reflections
Overall, the experience of watching this was…average.
In summary, this anime can be described as…
A glossy paranormal teen romance that borrows vampire aesthetics but doesn’t really commit to being a vampire romance, carried mostly by strong visual design and a genuinely good soundtrack.
Strengths and weaknesses
Strengths:
- The animation quality is consistent, and the character designs are genuinely distinctive. In a cast this large, never being confused about who is on screen is an achievement worth acknowledging.
- The opening song is excellent, and the ending animation has a charm that the main episodes don’t always manage.
- The dynamic between vampires and werewolves, the mutual hostility, the territorial tension, is one of the more entertaining threads the show holds onto.
Weaknesses:
- Too many characters for the episode count, which means most of the cast remain surface-level regardless of how appealing their designs are.
- The vampire identity does almost no narrative work. Replace the fangs with mage robes and the story runs identically, which is a problem when you’re selling the show as a vampire series.
- The reverse harem setup collapses into a tilted love triangle early on, and without genuine romantic tension, the story loses its main pull.
- Predictable from the midpoint, with a convenient finale that doesn’t fully earn its emotional register
Bingeability, is it an easy watch?
Yes, it’s an easy, low-commitment binge. Each episode is short enough that you can move through the series in a couple of sittings, and nothing in the story is demanding enough to need your full attention. That said, it’s not a binge you’ll feel compelled to push through. It’s more of a comfortable background watch, something to put on when you don’t want to think too hard. Save it for a quiet moment when you’re not in the mood to be challenged.
Re-watch value
Unlikely for me. There’s nothing in the viewing experience that would benefit from a second run, and nothing unresolved enough to pull me back. If the story continues in a second season, I’d give that a chance, particularly if it broadens its focus beyond the central romance, especially if Khan and Solon are given anything meaningful to do. But the first season on its own? Probably a one-time watch.
What will stay with me
The feeling of missed potential. A story that could have explored deeper prejudice, identity, and vampire lore but settled for safe romance tropes instead, yet had the romance be unsatisfactory.
The question that’s been sitting with me since I finished this is less about the series itself and more about the genre. Where did the dangerous vampire go?? There was a time when vampire fiction carried a genuine threat, the sense that something in the dark actually wanted something from you and might not care whether you survived the encounter. Dark Moon: The Blood Altar is nowhere near alone in trading that threat for softness, but it’s a particularly clear example of the trend. These boys could hurt someone. The story makes absolutely sure they won’t. And I think that’s the thing, the softness isn’t just a tone choice, it’s actively in the way of the story the premise promises.
Favourite character: Khan and Solon
I know, I’m picking the wolves in a vampire series. Khan has the kind of contained, watchful quality that I’m reliably drawn to, and Solon’s position as a hybrid caught between two worlds is the most interesting premise in the whole show. Neither of them gets nearly enough screen time for it.
Most annoying character: Sooha
I genuinely tried with her. The backstory is understandable, the hatred of vampires is earned by what she’s been through, and her stubbornness has logic behind it. But she consistently could not see outside her own pain long enough to treat the people around her with basic consideration or individualisation. The birthday present moment in the earlier episodes made me pause for a minute. It was a self-focused gift disguised as consideration. She had every right to her feelings and still managed to be the most frustrating person in every room she walked into.
A few quotes I liked
“I have a thing for the myths and legends of old.”
~ Heli, Dark Moon: The Blood Altar Episode 1 English Dub
This one caught me early, and in retrospect, it’s a little ironic, the boy who loves old myths is living inside one.
“We can never know what battles rage in the shadows of others’ hearts.”
~ Enzy, Dark Moon: The Blood Altar Episode 5 English Dub
Probably the most quietly affecting line in the series. It does more character work in one sentence than most of Enzy’s actual screen time manages.
“Forgive me for all that I am. You can run away from me tomorrow, but please, can you just run away with me tonight? Only until I can get you somewhere that’s safe.”
~ Heli, Dark Moon: The Blood Altar Episode 7 English Dub
This is the line that earns Heli his place at the centre of the story. It’s got just enough desperation in it to feel real, and it lands because it doesn’t ask for anything beyond the immediate moment. The dub delivery helps.
Quick questions and answers
What is Dark Moon: The Blood Altar based on? It’s an anime adaptation of a manhwa/webtoon created by HYBE in collaboration with Naver Webtoon. The characters and their story were originally inspired by ENHYPEN, the South Korean K-pop group formed through the 2020 audition show I-Land. The webtoon ran from January 2022 to August 2023.
Is the English dub worth watching? It’s a UK-produced dub and the voice cast do a decent job with the material.
Do you need to know ENHYPEN to enjoy the series? No. The anime stands alone as a story and you won’t be lost without any knowledge of the group. That said, fans of ENHYPEN will likely get more out of the character dynamics since each boy maps onto a member’s public persona.
Is Dark Moon: The Blood Altar worth watching? Conditionally yes, if you’re specifically in the market for a light paranormal reverse harem. If you’re hoping for something with genuine vampire threat or a tightly constructed supernatural plot, it will disappoint. Go in with appropriate expectations and you’ll have a reasonably comfortable time.
Is Dark Moon: The Blood Altar suitable for beginners? Yes. It’s a low-barrier entry point into the reverse harem subgenre — easy to follow, visually appealing, and not demanding of prior anime knowledge. It’s not a good introduction to vampire anime, though, if that’s specifically what you’re looking for.
Does Dark Moon: The Blood Altar have a satisfying ending? Mostly. It closes the main conflict and gives Sooha a meaningful role in the resolution, which is more than some 12-episode series manage. Whether it earns the emotional weight it reaches for is a different question, and my honest answer is: not quite. It’s a functional ending, and the theatrical approach in the final stretch is more fun than I expected. Just don’t go in hoping for something surprising.
Would I recommend it?
Conditionally. If you like reverse harem anime and you can adjust your expectations away from the vampire premise, you’ll find it a perfectly decent watch. If you’re going in because you want proper paranormal teeth to the story, you’ll come out disappointed. I’d specifically suggest it to anyone who enjoyed the ENHYPEN webtoon and wants to see the characters animated, and to anyone who’s newer to the reverse harem genre and wants a relatively gentle entry point. For everyone else: wait for a quieter week.
Have you watched Dark Moon: The Blood Altar?
Have you watched Dark Moon: The Blood Altar? Did the reverse harem setup work for you, or did you feel the cast was too large to get invested in? Which of the boys did you actually end up caring about, and was it also the wolves, or is that just a me-problem?? Will you be watching if there’s a second season? Let me know in the comments.
My Rating: 5.2/10
| Story | Animation | Sound | Characters | Pacing |
| 4 | 7 | 7 | 4 | 4 |
A watchable but ultimately underwhelming paranormal romance that doesn’t make enough of its own supernatural premise. The visuals and soundtrack are the strongest elements, but neither is enough to carry a story that loses its grip midway through.
Date Watched: 30 March 2026
On an unrelated note, what does anime recently have against ruthless vampires?? We used to get monsters. Now we’re getting softboys with fangs, and I genuinely mourn the shift.
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