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Series Group
Inside the Cave of Obscenity
Type
Web Novel (JP)
Genre
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Rating(4.1 / 5.0, 368 votes)
5    66% (243 votes)
4    10% (36 votes)
3    7% (26 votes)
2    6% (21 votes)
1    11% (42 votes)
Language
Support Book (#ad)
Author(s)
One entry per line
Artist(s)
One entry per line
Year
Example: 2012
2013
Status in COO
Status in Country of Origin. One entry per line
13 WN Volumes / 139 Chapters (Ongoing)
19 LN Volumes (Ongoing)
Licensed
No
Completely Translated
No
Original Publisher
One entry per line
English Publisher
One entry per line
N/A
Release Frequency
Every 34.7 Day(s)
Activity Stats
[Graph]
Weekly Rank: #9310
Monthly Rank: #9544
All Time Rank: #869
Reading List
[Graph]
On 11305 Reading Lists
Monthly Rank: #10458
All Time Rank: #264

Description

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A world where the [Demon King] was defeated by a [Hero] that came from another world. People carelessly forgot about their fear of the [Demon King] and of monsters, living in peace.

In a forgotten and run-down cave in the mountains, a new monster that should not have been born was given birth.

The monster’s name was the [Black Ooze]. It was nothing exceptional other than its black color, an ordinary slime.

However, this slime had the special characteristic of being able to take the abilities of the living things it swallowed. It preyed on an insect that had paralytic poison, as well as other animals. Following that, it attacked a human, obtaining his knowledge and [Desire].

Before long, the monster established its target as the female mage that came to explore the cave.

This world still wasn’t aware.

[A Monster Was Born]…

Associated Names
One entry per line
ICO
Inbi na Doukutsu no Sono Oku de
淫靡な洞窟のその奥で
Related Series
N/A
Recommendations
Happy Peach (3)
Bishoujo wo Jouzu ni Nikubenki ni Suru Houhou (2)
Ero Gacha (1)
Adventurer Lindy’s Calamity (1)
Maou no Hajimekata (1)
X-ray Is More Than I Thought (1)
Recommendation Lists
  1. Novel Tracker
  2. Reading now 2
  3. tent**les
  4. Things I've Read pt 2
  5. pls remeber ''

Latest Release

Date Group Release
07/19/24 RD-MTL v13c9
07/18/24 RD-MTL v13c8
07/16/24 RD-MTL v13c7
07/12/24 RD-MTL v13c6
07/11/24 RD-MTL v13c5
07/10/24 RD-MTL v13c4
07/08/24 RD-MTL v13c3
06/26/24 RD-MTL v13c2
06/20/24 RD-MTL v13c1
02/16/24 RD-MTL v12c8
02/15/24 RD-MTL v12c7
02/14/24 RD-MTL v12c6
02/12/24 RD-MTL v12c5
02/08/24 RD-MTL v12c4
02/07/24 RD-MTL v12c3
123…12
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Write a Review
28 Reviews sorted by


Ziru Asteri
Ziru Asteri rated it
August 22, 2016
Status: v3
Before reading this series, I believe that it is important to realize that it heavily includes the following elements: r*pe, tent**les, mind break. These are not for the faint of heart, and if you are someone that does not like those themes, this series will absolutely not suit your interests. I implore you, please do not go into this expecting something that this novel is not. It will only serve to sour your mood!

That said---

If you are fine with those themes, however, you'll find the flow of the writing and... more>> character progression---as well as their sweet, sweet degeneration---to be better than most other translated ero novels in our community. Written in a mix between third-person view and first-person character thoughts, this series centers around a monster that should not exist---the [Black Ooze]. In a world that has firmly settled into its post-demon king era, no one suspects that something like a monster could exist in such an out-of-the-way abandoned mine. If you are intrigued for what happens after that, I wholly recommend giving this series a shot.

Also, if you love breasts, you'll love this.

Spoiler

Our main character, the black ooze, doesn't particularly act as one---at least, in this first novel---so much as a plot device of honeybadger proportions. From what we see in this first volume, its intelligence is improving over time as it absorbs more and more of its prey. We didn't get to peer too much into its head this time, but perhaps we will in the volumes to come?

[collapse]
<<less
123 Likes · Like Permalink | Report
kenneth223
kenneth223 rated it
August 23, 2016
Status: v1c2
Trust me, not for the good of the heart. You will feel weird inside and even your PP will feel weird when you're reading it... must fap more!

Spoiler

An Intellectual slime; Tentacle r*pe with possible imp**gnation. Basically, just tentacle r*pe play.

[collapse]

PS. You will definitely 'fall'.
40 Likes · Like Permalink | Report
Overlord
Overlord
October 3, 2016
Status: v2c1
If you like novels with happy end (-ings), this will be your source of juicy joy. 69/5 stars - it's one of the better ero novels out there, naturally, only in comparance to the genre in general and if you're fan of c*ck magic.

Believe it or not, but we have some actual story going on here, with monster (character) development and plausible monster ecology story-telling.
33 Likes · Like Permalink | Report
0000000
0000000 rated it
February 5, 2017
Status: v2c2 part6
Giving it a full 5* to show just how messed up I am lol. Jokes aside, there are actually character developments and stuff, weird because we are having such developments at this early stage, most novels at this stage are either donkan MCs s*upidity, kill kill kill, slice of never changing life, etc etc. Also, giving it a 5* for loving how the MC likes to screw with the victims, male and female. For female, it's r*pe until they mind break, which seems plausible yet I am doubtful... For male,... more>> it is killing them slowly while making them watch the female gets r*ped, makes it more messed up as the female, who is being r*ped, is watching the male slowly dying. Like 2 perspectives, male -> female: look how nice of me to let you have a grand view before dying. female -> male: look how nice of me to let you live while the other guy is dying painfully.

Really hope that there is actually an artist out there working on this piece here. <<less
29 Likes · Like Permalink | Report
San-Kyu
San-Kyu rated it
March 26, 2017
Status: v2c3 part2
The premise is interesting enough to warrant reading just for it. You have a protagonist that isn't human and it isn't just about their race or body. Its a slime that thinks in a very logical and curious manner, with absolutely little in the way of morals that other R-18 protagonists usually exhibits. Even the rapist protagonists aren't driven like the slime here, pretty much all it does is for sustenance, learning, growth, rather than for its own pleasure. The fact that it dabbles in more deviant themes such as... more>> tent**les, slime, drugs, and mind break is something to consider. The whole thing is written a bit like a horror story with the protag as the monster/villain. Updates are very slow however so be warned that the novel continues for quite a bit but the translator isn't focusing on this so that kinda sucks. <<less
15 Likes · Like Permalink | Report
kane2929
kane2929 rated it
April 3, 2019
Status: v3c1 part6
this is... AMAZING!.. my fap count is in the double digits for this.

cave of obscenity is another novel that proves that SLIME protagonists are really the best, followed by a certain spider.

i wanna read more chapters but the releases are so slow and so... please!! spread this around, share this to your otaku/hentai friends and make this novel popular enough so that the translators will place more priority on Inside the Cave of Obscenity. Do this to make fellow men happy.
14 Likes · Like Permalink | Report
NovelHamster
NovelHamster rated it
June 2, 2021
Status: v3
Seriously?

The protagonist is a monster slime that can't even communicate. It keeps on tentacle raping all the women it comes in contact with. The women magically fall in love with it after experiencing or**sms. The human females also somehow bear slime children.

That's basically the whole story... I was expecting the slime to be able to transform and be intelligent, but that was a disappointment.

I don't have a tentacle r*pe fetish, so I can only treat this as a comedy. Even as a comedy, the story is quite repetitive and predictable.... more>> You won't be able to read through it if you aren't a tentacle enthusiast. <<less
12 Likes · Like Permalink | Report
LeeEzekiel
LeeEzekiel
September 9, 2016
Status: v1c2
This other reviewer... nothing about the name, description, or tags is misleading, and he wants to be outraged and rate it 1 Star when the story is exactly as presented. Seems more like he's in denial about his own tastes. Also lol, "garage".

Anyway, this is some fairly hardcore smut, but it feels like the author is setting it up to be a genuine horror story too. Like a catastrophe that descends upon the kingdom and results in widespread despair. In other words, closer to a Lovecraft monstrosity than a typical... more>> ecchi anime. It doesn't shy away from gore either, the story is perfectly willing to describe creatures (and people) being killed, smothered, torn apart, or consumed.

With only two chapters so far, it's hard to say, but the writing and translation quality are fairly top notch for now. We'll see how it goes. <<less
10 Likes · Like Permalink | Report
fearthedeep
fearthedeep rated it
September 17, 2017
Status: v2c5
Truly a masterpiece, I love "constant or**sms" and "forced or**sms" work and this is truly a tier above in those categories. (ಠ ͜つಠ)

If you're looking to fap and also be intreguied by some plot, this is for you. It's basically p*rn with a good plot! XD

tenouttaten
9 Likes · Like Permalink | Report
Althairus
Althairus rated it
April 2, 2022
Status: v6c1
Good story. At the beginning it seems like a story that has to be read with one hand, but without you realizing it, you end up following the plot with the same intensity that the story evolves on choices that seem ban*l and obvious, but that come used to make it grow.
8 Likes · Like Permalink | Report
berdanka
berdanka rated it
July 22, 2019
Status: v2 illustrations
This story is really nice and balanced for an adult novel about monster raping innocent girls. This is not isekai and the monster is really not a human. It just likes to "hunt" girls for a specific reason. It is merciless to men but it doesn't kill women. Though women not treated like humans, they fed, protected, and heavily loved.

Multi-pow storytelling makes things wonderful. Every pray have some depth and backstory. And women are still significant even after being r*ped. They are broken but still keep their individuality. It's important... more>> because I hate hypnosis and complete mindbrake.

Overall the balance is good. It's not a brainless s*x script like it usually happens with short r18 novels. Also, the illustrations are great.

If you searching for a le*d novel with some proper story and you don't care about tent**les r*pe, then this one is exactly what you need. Though it's a shame that it isn't fully translated yet. <<less
5 Likes · Like Permalink | Report
mmem
mmem rated it
August 23, 2016
Status: v1c2
Too soon to tell but I like the writing. Wish the author was kinder when describing women.

Seems like there could be an interesting plot but the story may end up just being about girls being r*ped and mind broke by a slime. Currently looking forward to more chapters.
5 Likes · Like Permalink | Report
Adesina66595
Adesina66595 rated it
December 21, 2020
Status: --
if you read the negative review of this story youed see that the people who write them either didn't read the summary are dumb or are just SIMPs that can't Handel this story this story is great and is the one of the best if not the best. R-18 novel you can find on novel updates the MC isn't a h**ny dog like most MC's you find In other r-18. Novels the author writes the story in a way that makes it both a r-18 and horror story... more>> at the same time the MC is a a slime that wants to survive and grow he's not a reincarnat but he gains knowledge after find out how to imp**gnate female s he start to create of spring and you know were it goes from there I'm not good at making reviews but I advise you to read this is going to be healthy and pleasent for both you and your little brother you might even increase your cultivation base (meaming grow in size) <<less
4 Likes · Like Permalink | Report
SisConEcho
SisConEcho rated it
October 19, 2018
Status: v3c1
I came here coz Tensei Shitara Slime Datta Ken was a bit lacking in "Slime" and character growth.

This Slime here faces more meaningful challenges and side characters are a bit more developed as far as ero goes.

I'm rating it a 3/5 as word choices and phrases get pretty repetitive, and the plot advances very slow.

I may be too harsh as I see great potential with this writer in storytelling but am left feeling even more empty due to the want for more story and development.
4 Likes · Like Permalink | Report
thedabisme
thedabisme rated it
August 9, 2022
Status: v6c7
Great for people that just wants to see the world burn, in more than one way. Spoilers for up til V6 ... more>>
Spoiler

from people falling into an addiction for s*x, up to a literal country destroyed and turned into something that isn’t a happy sheep farm, this things got almost everything in it, other than futas, (don’t add them tho lol. Author prob won’t see this).

[collapse]
I think that the LN got a bit more tame because that’s how most things go, but I haven’t read it yet. So if it was actually made to be more tamed, I would honestly be surprised. <<less
3 Likes · Like Permalink | Report
poppitypop
poppitypop rated it
August 18, 2021
Status: v2c3
The slime protagonist has potential, but it's difficult to get identify with. Telling the story from other people's perspectives, predominantly, gives off a netorare feel as opposed to a netori feel. I can put up with netori, but NTR is just plain unpleasant to me.

Technically, it's netori since the slime is the protagonist. However, if you need your protagonist to be somewhat human to identify with them, then you might experience the story as NTR too. If you're into NTR, this could be a novel for you. Otherwise,... more>> skip it. It'd have been better if the story was written in a way that'd allow you, as the reader, to identify as the slime. <<less
3 Likes · Like Permalink | Report
HentMas
HentMas rated it
October 11, 2020
Status: v2c3 part3
Meh...

I was waiting for something to move forward but... it's just r*pe after r*pe after r*pe after r*pe after...

you get the deal...

... more>> If you want to read something with the same vibe but actual story, go read "Maou no Hajimekata" because that one is much more competent even if filled with s*x and all the perverse things this one haves, it haves an actual plot and set up and pay off and... it's a real story.

This one isn't... sexy, isn't... exiting, isn't... anything other than a jumble of things that "happen".

It's just... perverse without rime or reason.

V3 it's the exact same thing...

I don't mind works with NTR or Mindbreak or whatever else, but this one isn't interesting to me, I want to see some character progression, not just... a thing that f*cks... <<less
3 Likes · Like Permalink | Report
Kassy
Kassy rated it
July 22, 2022
Status: --
1 stars for the author's writing

1 star for the translation

R*pe with r*pe with r*pe more more and more more more r*pe

... more>> This is not for me, I decided not to continue reading

I read the webnovel until volume 3

Very well written, the s*x scenes, the thoughts, the actions, everything was very well written, but it's just r*pe, mental breakdown and sex

You can't connect with the protagonist, he's just a monster with the desire to possess, r*pe and imp**gnate women. His desire is to grow, multiply, and have women.

After a while the story gets repetitive, and I feel so uncomfortable with the s*x scenes, he doesn't do it because he likes it, he doesn't even have a boner, he just has it, and makes it pregnant. <<less
2 Likes · Like Permalink | Report
Patchi_
Patchi_ rated it
March 26, 2021
Status: v3c1 part6
Very good. That's your review.

IMPORTANT: v3c6 is a last chapter translated.

At the moment of writing this review I decided to start learning Japanese just to read all the other volumes. There is 11 volumes all 500 yen each. That's how much I like this novel.
2 Likes · Like Permalink | Report
H2oJacKle
H2oJacKle rated it
March 29, 2023
Status: --
it's good story so far a lot of explanation about everything for me I think it's bit too much explanation and I found myself kind of annoy to read it because it talk about same thing over and over again. Protagonist (?) was slime just slime no more than that it's good that story keep it that way but it's double edge as well story will be too flat including s*x scene too (I had only r*pe)

I know kind of story won't get much but if you need to... more>> read 9 volume but story doing the same thing in every chapter it feel like boring to read it anymore (so everyone will got r*pe anyways so why don't you still care to read it)

It still good one but reading it too much kind of get me bored maybe I'll read it from time to time <<less
1 Likes · Like Permalink | Report
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