Inside the Cave of Obscenity (18+)

Alternative Name: 淫靡な洞窟のその奥で
Author: Ume Tane / ウメ種
Artist: Afu Kuro / アフ黒
Category: Japanese Light Novel, Fantasy, Smut
Status: 5 Volumes (Ongoing)
Source: –
Translator(s)/Translation Group: Ziru’s Musings
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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 peacefully.

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]…

Warning: Depictions of Rape

If you enjoy this translation, consider buying an original copy of the series in its native tongue to support the author.

eBook Store Page: Volume 1Volume 2Volume 3Volume 4Volume 5


Volume One
Chapter 1 – The Day It Was Born
Chapter 2 – Adventurers







Volume Two

Chapter 1 – Fresh Prey
Pt1 Pt2 Pt3

Chapter 2 – The Abandoned Mine’s Investigation
Pt1 Pt2 Pt3 Pt4 Pt5 Pt6

Chapter 3 – The Adventurers Who Fell
Pt1 Pt2 Pt3

Chapter 4 – The Knight Order’s Dispatch
Pt1 Pt2 Pt3 Pt4

Chapter 5 – The Female Knights’ Dignity

Chapter 6 – A Pleasuring Corruption

Chapter 7 – The Female Knights’ Fate





Volume Three

Prologue – Escape
Chapter 1 – Crucible of Pleasure
Chapter 2 – In the Royal Castle
Chapter 3 – Creeping Unnoticed






Volume Four








Volume Five


18 Responses to Inside the Cave of Obscenity (18+)

  1. LeTouriste says:

    Pretty good,i can’t wait for more:)

  2. ravencraven says:


  3. ravencraven says:

    r u guys going to any updates on this series or the updates just going to be done ziru’s musings?

  4. darkmist says:

    Love this 😁
    Please update as much as you can 🙏

  5. . says:

    There should be a donation page for this to prompt the translator to translate faster!

  6. Crywolf641 says:

    Hahahaha i like this already! Just reading the description get me on!

  7. SanKyu says:

    Seconded on that donation page. This one is quite different from the other 18+ novels I’ve read, given its unique protag. Really hoping for more releases soon!

  8. taetaetik says:

    thank for the chapter, it’s interesting in a slime that be truely a slime 55, can’t wait till vol 5.

  9. habib says:

    So much of tenticals. 🤒

    I thought sooner or later the slime will assume the form of a man, and infiltrate the town. 😎

    But that, sadly, did not happen. 😑

  10. Weabookun says:

    Many thanks for translating this. Damn, vol 5 cover is interesting, as it shows that the queen is fighting back.

  11. FapTactics says:

    Continual orgasms are my fetish.
    I did NOT expect to find my #1 fetish while looking for an interesting LN to read…
    I really hope this project doesn’t get completely dropped because I’d highly enjoy reading all of these.

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