The Devil’s Origin


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When I woke up, I became the Demon King!?

It’s my responsibility as the Demon King to increase the monster population, and the only way to do that is to mate with as many monsters as I can…

This is the beginning of my life as a monster-making Demon King.

Associated Names
One entry per line
Related Series
Otoko Darake no Isekai Trip ~BL wa Okotowari~ (3)
I Was Reincarnated (3)
The Reader and Protagonist Definitely Have to Be in True Love (2)
Every Day the Protagonist Wants to Capture Me (2)
Ai o Ataeru Kemono-tachi (2)
Estrus Gymnasium (1)
Recommendation Lists
  1. Paddling several boats - BL Harem List
  2. Yaoi/BL Im Reading
  3. Favorite Novel
  4. MPReG/OMEGAverse
  5. Mister, I would like to read all of those please

Latest Release

Date Group Release
11/29/19 Luukia c34
09/05/19 Luukia c33
08/21/19 Luukia c32
07/17/19 Luukia c31
06/17/19 Luukia c30
05/27/19 Luukia c29
05/13/19 Luukia c28
04/12/19 Luukia c27
03/19/19 Luukia c26
03/09/19 Luukia c25
03/01/19 Luukia c24
02/14/19 Luukia c23
02/07/19 Luukia c22
01/17/19 Luukia c21
01/11/19 Luukia c20
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11 Reviews sorted by

New Kazekun rated it
January 14, 2020
Status: --
This is the first time I read quite peculiar b*d scene you know with too various creatures involve, like actually, i've passed this story before like "come on, different races x human, would be strange, right?" but one day I feel curious and then banngg, I read it. Somehow, I can't stop reading it, feels like opening a new door?? Well, I don't read some scene like with orcs and doing "it" while eaten literally. Am I the only one who is quite bothered to it, but still waiting for... more>> translator to translate it? And also still give 5 stars as I hope the MC will have HE with his "human form" partner, whoever will be, harem also will be good as long as they are in "human form". I think this is the first time for me writing such long review. Well, to sum up if you are interested to some "new insight" BL story, perhaps you may try this one, with some warnings in some aspects, well just try to read it by yourself. As for me, I will still well read it, haha. <<less
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Reitian rated it
September 26, 2017
Status: c84

The story is very unique, with a lot of thought and research put into the anatomy of each monster. It's amazing how the author considered the unique characteristics of each monster to form their unique personalities and backstories. I really respect that after so many monsters, each one feels refreshing and unique. I was also surprised that this wasn't just a fantasy about having s*x with monsters; not all monsters are friendly.

I also like that it has a bit of philosophy and touches on subjects such as... more>> pollution and, well, the end goal of world peace for both sides.

For example, I loved the portrayal of the hero. He isn't a bad guy just because he's the natural enemy of the demon lord and kills monsters. The hero has his own troubles. The demon lord tries to understand him so that both sides can attain peace, and the hero, who fell in love at first sight, falls even hard for him.

It shows that while this is 95% smut, the 5% of world building helped make the world immersive.

The author occasionally writes a chapter where you see all the major monsters collected so far, so if you like one, chances are, it'll pop up again. <<less
31 Likes · Like Permalink | Report
MofuMofu rated it
July 14, 2017
Status: c85
Many disgusting moment but the story is absolutely soo unique and interisting. I like the mind break and psychological event. Ahhh and the story of each monster. Especially the story of the hero in this story
... more>>

[who is fall in love with him. Many misunderstanding the maou had to hero, but I like it when he planning to negotiate with the hero, and try to understand his place as hero. Kuhhh I wanna them not be an enemy, really. Even though the hero is an absolute pervert, I like his story....]


Anyway this is a wonderfull story and if you can telorate some disgusting event here and there, then you will find a beautifull story... <<less
22 Likes · Like Permalink | Report
RandomProcrastinator rated it
September 7, 2017
Status: c84
It's pretty good despite being too graphic. Most of the characters (mostly the humanoid ones), even with almost no character development, are likable.

... more>>

I especially like the hero (lol). He never fails to make me laugh when the MC reads his perverted thoughts. He's super OP being lvl 800+. Despite being the hero, thus, an enemy, he's quite hard to hate especially once his background was told. Beside him, I also like the dark dragon (according to google translate but it could be black dragon), fenrir, basilisk and vampire (that cosplay pervert).


Just a warning though:
IT'S HARDCORE YAOI SO IF YOU'RE NOT INTO THAT THEN I DON'T SUGGEST READING IT. And also, that r*pe and Pregnancy tag is not for display (bestiality should also probably be added just to be safe even with the monster tag). Almost all chapters contains s*x scene (not that it's that much of a problem since that's most probably the reason why you're reading this) and considering that the MC have the body of a child with adults (if it was even in human form) as partner, you can pretty much guess how it ends. If you're fine with that then you're good to go.


Seriously though...A giant, Kraken, Leviathan, etc. Then there are some with multiple partners... His body returns to it's previous state which means he's always like a virgin... And the C-section (can't forget that one, it's without anesthesia)

20 Likes · Like Permalink | Report
Bai Xiaolong
Bai Xiaolong rated it
January 1, 2018
Status: c26
I love yaoi period.

So when I read the synopsis, I was instantly hooked. It's not like previous yaoi I've read when it takes a pretty good amount of chapters before you get to the steamy part. No, it skips all that and takes a plunge into parts that make you want to blush on the second chapter.

But, you know that you are expecting it as soon as you read the summary so it's not that surprising. Every single chapter is basically filled with s*x.

I'm really looking forward to the releases.
15 Likes · Like Permalink | Report
sleepingjay rated it
June 10, 2017
Status: c25
So far the story is very entertaining, due to its incredible wackiness. It's definitely not the usual plotline you see on NU, and both the writing and translation are pretty good.

... more>>

The MC is 100% confused, but he also has a spine, despite mostly going with the flow (forced to). The "system" that guides the MC is hilarious because of how merciless and blithe it is to the mc's confusion, though it does help the MC somewhat. The story development is too fast paced so far, but it's forgivable with how entertaining it is.

Warning for weird stuff such as shota, mpreg, laying eggs. It's also implied there will be bestiality in future chapters. It's not exactly a new kind of porn on the internet but definitely isnt the norm for NU.

Edit for ch24: Rape. Tbh I should've known it was coming. Previous chapters had dubcon situations, but this was the first one where it was explicitly noncon, but then the rapist had a sad backstory and MC Forgave and Accepted him and yeah, f*ck that. I'm tossing this one out.

The story started out as a pretty fun, unapologetic porn, but it's gone into far more dubious stuff. I'm pretty sure the author's just trying to fit every possible kink into the story, but that's made the story lose its fun for me.

By now I'd say half the s*x is dubcon, and it's just unpleasant to sit through now. I draw the line at excusing rape. Changed my rating from 4 to 1 too.


Edit: see spoiler. Changed my rating since reviewing at ch4 <<less
13 Likes · Like Permalink | Report
yourheatherness1297 rated it
July 1, 2017
Status: c5
The novel is simple, straight to the point, and very easy to read. The tone is light hearted and humorous.

The characters lack a bit of depth and dynamism, but its just the start. So, we will have to wait and see. Even so, they are quite likable.

The story doesn't dilly dally with unecessary filler chapters to the point of it being fast-paced and linear.
11 Likes · Like Permalink | Report
emletlei rated it
May 22, 2017
Status: c3

Idea is pretty original and who like yaoi probably will like it. Still is fking weird, is like bestiality yaoi, something like a hero with demi-humans, but this one is Devil with monster...o gosh.
9 Likes · Like Permalink | Report
ResidentialPsycho rated it
March 3, 2019
Status: c24
This is like slapstick comedy man x monster sex. This series makes me feel a baffling combination of being feeling turned on and laughing so hard that tears come from my eyes. I'm not entirely sure how to react to this series, but I really like it and caught up with all the recent chapters in one sitting!

The comedy is great. The monsters are great. Even the world-building and setting are great.

And then... there's the hero lurking around in the background, upping the suspense and tension with every appearance.

This series... more>> is definitely bizarre, and I am not sure I could read it if it were in a graphic novel format, but it's definitely worth checking out for those who are curious or just like yaoi!... If you are neither curious nor interested in yaoi, however, you may see something you might not be ready for. In that case, your world may be opened to a whole new range of experiences you're not sure you ever wanted. You have been warned. <<less
3 Likes · Like Permalink | Report
Black Sage
Black Sage rated it
December 7, 2019
Status: c34
I really love ittt!

This novel has ALLL that we fujoshi need!!

Yeahg it contains rape.

But this made the story more interesting.

I love u translators San!!

1 Likes · Like Permalink | Report
XiaoMango rated it
November 13, 2018
Status: c14
Seems interesting to see how the devil "repopulate" the world with different monsters. I would like to thank the new translator for picking this novel up, it is definitely going to be fun reading the "adventures" Mao-kun will go through.
1 Likes · Like Permalink | Report
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