Behemoth’s Pet


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The elf girl, Aria is an adventurer. Her enchanting, lovely features attracts everyone. Her twin peaks are ripened to the point of exploding. Then, being embraced in between those twin peaks was a little animal… his name is Tama.

He looks like to be a cat at first glance, but Aria and her surrounding companions failed to take notice of single detail. Tama, he’s a human who’d reincarnated, given a second chance at life. His true form, it’s not that of an ordinary cat. Instead, he’s a monster of the strongest class, an extremely young behemoth.

Associated Names
One entry per line
I'm a Behemoth, an S-Ranked Monster, but Mistaken for a Cat, I Live as an Elf Girl's Pet
I Am Behemoth Of The S Rank Monster But I Am Mistaken As A Cat And I Live As A Pet Of Elf Girl
S-Rank Monster no Behemoth Dakedo, Neko to Machigawarete Erufu Musume no Kishi (Pet) Toshite Kurashitemasu
Related Series
Reincarnated as a Dragon’s Egg ~Lets Aim to Be the Strongest~ (2)
The Spearmaster and the Black Cat (1)
Woof Woof Story ~I Said I Wanted To Be A Rich Person’s Dog, Not A Fenrir!~ (1)
History’s Strongest Husband (1)
The S-Classes That I Raised (1)
Monster Pet Evolution (1)
Recommendation Lists
  1. Isekai that is actually good
  2. Male Protags
  3. MC with ability steal or skill creation in another...
  4. the culture entertainment of isekai
  5. BL/BG/No CP - Meow Meow Meow?

Latest Release

Date Group Release
10/11/21 Foxaholic c150
10/05/21 Foxaholic c149
09/28/21 Foxaholic c148
09/20/21 Foxaholic c147
09/13/21 Foxaholic c146
09/06/21 Foxaholic c145
08/31/21 Foxaholic c144
08/24/21 Foxaholic c143
08/09/21 Foxaholic c142
08/03/21 Foxaholic c141
07/27/21 Foxaholic c140
07/20/21 Foxaholic c139
07/12/21 Foxaholic c138
07/06/21 Foxaholic c137
06/29/21 Foxaholic c136
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16 Reviews sorted by

Farewell Demon
Farewell Demon rated it
July 11, 2018
Status: c6
The start is good. A guy reincarnated as a cat (behemoth), and he cat get skills by eating monster (like rou from re:monster). But when you get to chapter 20+ it's become worse. The cat try to hide his power, by sacrificing the potential he has.

It's really rare for me to rate a Japanese novel this low, but I think the author really f*cked up
27 Likes · Like Permalink | Report
Scarletmenace rated it
October 23, 2018
Status: c19
At first it grabbed my attention that the MC was reincarnated as a monster that had to work his way up the ladder. Unfortunately, the story immediately fell when he introduced the big tittied Keebler elf, reducing the onward chapters into a man writing a 15 page essay on the wonders of tit flesh.

Like seriosuly.... this guy won’t shut up about tits.

Seriously, this is just one of those novels that lures you in with an awesome summary, when in reality it’s just a ero LN about a guy who gets... more>> away with ecchi stuff thanks to his cute kitten body. <<less
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admira rated it
February 6, 2019
Status: c33
TL;DR: You'll probably like it or hate it.

Expect vulgarity and not-so-subtle female objectification from ch 9 onward. It is tagged as ecchi, but this is absurd. The female lead's breasts are the main point of any interaction involving her. That aside, the plot is pretty bland with a lot of viewpoint switching. I only skimmed ch15-33, but it was more ecchi with bland plot.

The long version: 3 stars for the boring plot, -1 for the vulgarity = 2/5 stars.

This is a pretty vulgar novel, to the point where I found... more>> it off-putting. I'm fine with mature themes (cursing, violence, sex, etc.) but the male mob characters are extremely vocal about "voicing their impressions" such as admiring "those tits" (11) or "look at those things jiggle!" (c13).

Somewhat more expected (it is ecchi), every interaction the MC (infant behemoth/kitten) has with the female lead either revolves around or mentions her breasts. This escalates further.

That aside, the plot is pretty bland. There's the expected powering up and convenient explanations for the MC's odd behavior and characteristics. There are the usual cliched situations, like the sleezy nobleman adventurer and elf ears being an erogenous zone. The viewpoint is inconsistent--1st person and 3rd person limited, and the focus switches a lot when it's 3rd person. <<less
15 Likes · Like Permalink | Report
sageinferni rated it
January 24, 2021
Status: c110
Today is January 24th, 2021. This is Sageinferni, your reviewer for today, bringing you your 'by chapter 110' review.

Let's see... I've read all the other reviews that have currently been posted and so I am putting forth my perspective on the details and opinions within them on top of my own opinions.

Keep in mind that, at the time I am posting this, I'm almost finished with all the chapters that have been released so far but it can be assumed that the previous reviewers will not read as far as... more>> me

The story is very fast-paced and the chapters are short. I personally don't dislike these traits. The worst thing in it is the f*ucked up "romance", if you can stand call it that, but I think that had mostly been removed by chapter 70 or 80, for the betterment of the story. Not fully, but it's much more palatable now. That may seem like a lot, but as previously mentioned the chapters are fairly short.

I do like the normal interactions between the main character and the other characters though. Cats are cute.

Also, while the plot advances really quickly I don't think that made it bad. And, from around chapter 100 on a great new plot point has been introduced to the readers that the characters haven't mostly caught on to yet, and it's completely hooked my curiosity.

You can ignore the review about the main character sacrificing his power. I won't give spoilers as to why, but just know that that person probably hadn't read much further ahead.

If I had one complaint, aside from the sh*t early on, it would be that the main character doesn't display much personality. But I also think that's because he doesn't talk and, being a pet, has limited agency.

This has been your 'by chapter 110' review, January 24th, 2021. <<less
11 Likes · Like Permalink | Report
CaptainButtshark rated it
May 20, 2020
Status: c20
Like the people above mentioned, 90% of the novel is MC talking about the heroine's tits. I don't think it's impressed enough though, which led to me making the mistake of reading it in the first place. Here's a couple excerpts

... more>>

Alone in the dressing room, Aria shamelessly and erotically undressed, followed by a deep scrub of her entire body to clean up. Of course, Tama took in every inch. A captivating figure that just begged to be touched, and not a single blemish or mark on her supple skin... but there was something that grabbed his attention more than anything else.

Two somethings.

It was those little devils on Aria’s chest, floating on the water’s surface. Drifting and swimming in the water, Tama couldn’t help but sneak peeks at them whenever he could



He had gone from enveloped in blankets to enveloped in breasts.

The... They’re huge! What even are these?! Appl—no, grapefru—no, melons!

Yes, this elf’s twin peaks were not hills, but mountains.

Even at a glance he could tell those sweater puppies couldn’t be kenneled in a cup size. That would have been like trying to store a desert in a litterbox. Still, if he had to think about it in terms of cups, they were... World Cup boobs!



It was a valley—no, a crevasse. With the exception of his head, Tama’s entire body was comfortably snug between Aria’s breasts. He could do nothing but shiver, eventually calming down and surrendering to his cozy cage, and overwhelmed by the sight themselves the street vendors gulped loudly without another word.


I get it, the novel isn't suposed to be taken seriously. But this isn't comedy, it's just some virgin's wild fetish about massive tits, elves and bestiality (Did I forget to mention she wants to f*ck the cat?) penned down.

For the love of God, spare yourself the pain and leave this novel alone <<less
6 Likes · Like Permalink | Report
Aho555 rated it
September 12, 2019
Status: c53
What the hell. I expected some heartwarming kitty cuteness with a pinch of ecchi but the actual novel only gives me half of that. The other half is made up of boob obsession plus something I'm not entirely comfortable with, even if this novel doesn't take itself seriously.

This is still better than those bad self-insert "cheat"/"slow-life" novels though.
6 Likes · Like Permalink | Report
GoldSweeper rated it
June 27, 2018
Status: v1c4
Everything seems good so far. Expecting abit more world building soon. Nothing too glaring in either the narrative or the translation. Might turn out as a good read.

As long as it doesnt turn out too monotonous it should be good
6 Likes · Like Permalink | Report
Custardmouse rated it
May 17, 2019
Status: c45 part2
Pervy greatness! No payoff R-18 scene so far, which is a little odd given the author's tendency to play up to just about any kinky fantasy genre weirdness out there, but the story is fun enough to keep you reading. The MC's knightly virtue and romantic drama beneath the comic perviness keep an otherwise bland dungeon story on track. The translation doesn't deliver artistic prose but it avoids grammer distractions and shows a little color during the racy parts, which shows the translator knows where the most detailed work needs... more>> to go. <<less
4 Likes · Like Permalink | Report
mmern rated it
October 27, 2020
Status: v2
Hmmm- i’ll be honest, I really liked this light novel and its story about some knight being reincarnated into a little kitten- and was then saved by some elf girl that had randomly stumbled upon Some dying cat.

and yes I know that some may not like the manga but also some do like it, and I hope That they’re will Be more in the future :)
3 Likes · Like Permalink | Report
November 21, 2018
Status: c23
Interesting story with a twist I didn't see coming. Also at one point the MC tries to hide his abilities but shortly after finds out he can get away with using them so it avoids that pigeonhole. The only problem is that the chapters are kinda short but that's pretty common with light/web novels.
3 Likes · Like Permalink | Report
Kradmax rated it
May 27, 2020
Status: c88
I really liked this novel. I'm looking forward to the time when Tama evolves permanently into an adult. I've read that there is a novel that is previous to this one and they even mention some characters in this novel, I wonder how is it called?
2 Likes · Like Permalink | Report
SxyFish999 rated it
March 11, 2021
Status: c73
Not bad tbh, story can be hectic ( (͡° ͜ʖ ͡°)), although intriguing and well-detailed (specially in the book), a really good pass-time read due to its World-Building aspects and it's approach in providing the story (a good mix of adventure and comedy, with some serious background stories). Started reading this when I bought Volume 1 and 2 Light Novels in Rakuten Kobo, but couldn't wait for the next volume so I decided to just start reading the web novel.
1 Likes · Like Permalink | Report
November 5, 2020
Status: c8
First of all, be warned - this is a Status novel with skill assimilation. It's a straight guarantee predicated on the MC eating even the smallest bit of an enemy. This kind of thing isn't sustainable even when it's far harder to take skills. Based on the tags and other reviews, this seems unlikely to be a major focus of the story, but still. It's a fairly major part of how everything works, and it's just going to get unmanageable.

Secondly, the translation. I'm not sure why several reviews have mentioned... more>> it being totally fine. It's not. It's understandable, which is unfortunately worth mentioning. However that's the best I can say about it. Tenses frequently switch sentence to sentence. Basic grammar is often utterly lost. For example, "Now that he found one, he want to at least checking the contain." It's not too hard to figure out what it means, especially with context, but it's still rather distracting. <<less
1 Likes · Like Permalink | Report
KoPLeaderKiactu rated it
July 10, 2021
Status: c132
First, it started off as a good read. Just your average light novel that starts off good enough to waste your time. Then, it throws ideas lifted from other media right in your face.

... more>>

In the latest arc (as of when I last read this) a bunny girl who's description fits Usada Pekora's appeared. To make matters worse, the name of the country where she resides just so happens to be a few letters off from said V-Tuber.


It's like the author is running out of ideas and is just putting in thinly veiled interpretations of things he likes. <<less
0 Likes · Like Permalink | Report
QWall rated it
November 19, 2020
Status: c43
I can't continue. The description got me intrested but this is basically a speed run with little substance. There's almost no structure or world building to it. There is a loose goal on the heroines part to gain strength, The cat wants to protect her but seems to be crippling itself by not taking any road to get stronger even if its right in front of him. Its all fluff, and while I like my occasional fluffy novel this just leaves me disappointed
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Bazka rated it
September 25, 2020
Status: c56 part1
Starts very well, but it never actually has any (noticeable) world building. It feels like a he**ai game when reading, there's few common sense elements in the casual aspects. E.g. "Labyrinth city", "adventures fill the guild"; there's not a single mention of anyone else being in the labyrinth (least where I'm up 2) there are no notable interactions with uncentral characters.

There are quite a few good parts, but there overshadowed by the bad.

I'd recommend the first part 2 read if you've got some spare time, but chapter 15~20 onwards isn't... more>> great. <<less
0 Likes · Like Permalink | Report
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