Etlina's Principle is a mature, adult game with VN style gameplay and focuses on the theme of the symbyote\living suit.
Humanity discovered a new type of living organism - a symbiotic life form called "Nox Limax,” which gave the hosts incredible powers. But one year after the successful tests on humans,
something happened that seriously changed the world.
Spoiler
At some point, people began to turn into slimy latex-like creatures.
The city's environment and its neighborhood, animals,
humans, and fauna changed drastically, changing the land into a perilous place,
like an alien planet with its flora and fauna.
You are a member of the HOWL Squad - a particular military unit designed to perform tasks in conditions of increased danger. On your way, you will meet many local inhabitants,
most of whom may not be as horrible as they are told they will be.
On your way, you will find a lot of friends and enemies.
In the end, it will be up to you to decide who is the real threat.
Who will you choose to support, and what possible results will that have on the people
you care about and the fate of humanity itself?
v0.05.0
What's new:
— New story content
Complete Operation "Zone of Silence" by resolving the dilemma and meet the new hybrid, who may become a romantic interest in the future.
— Two new sex scenes with Melisa (not optional) and Siena (optional)
(finally, a sex update!)
—
Fixed some text and dialogue errors
—
Most images have been converted to WebP format to save space
⚠
Attention!
⚠
I've received reports that the game becomes unstable when running with mods
(confirmed case with KoGa3's mod). Issues may include text errors,
duplicated sentences, and technical bugs. This is likely related to the
code of one of the features I implemented earlier, but unfortunately, I currently don't know how to fix it.
Therefore, please play without mods for a better gaming experience. And sorry for the inconvenience.
v0.04.0
— New story content
Meet the new commander of HOWL’s Fifth Squad — and prepare for an operation against Nox unlike any before. New threats await... and perhaps, unexpected allies.
— New squad and map customization system
Before each mission, you can review available gear and swap weapons/characters when possible. The map now serves primarily as an intel hub, with potential for future free-roam expansion.
— Some sound effects added in Version 0.03
— Official RU localization
—
Itch.io
release
v0.03.0
— Main story continues
- Meet FerTec agents and other UMF personel, your comrades and the mystical Nox girl who will offer you an extremely tempting proposal...
— New features screen - if you have previously created saves, a message will appear on loading where you can learn about the new features of this version.
v0.02.1
— Improved Dialogue and Texts
The in-game dialogue has been refined for more fluent English, and narration has been given a more literary tone, enhancing the overall narrative and immersion.
— Bug Fixes
Resolved the quirky issue where the main character (MC) referred to Elina as his sister, even when she was chosen as a childhood friend. Improved the scene advancement buttons in the rest segments. Now, they are more responsive, being activated by clicking on any part of them.
— New Menu System
Introducing a streamlined and intuitive menu system to enrich your interaction with characters and objects during certain scenes. Look out for the eye icon in the upper right corner of your screen. When hovered over, interactive characters will be highlighted with an outline. We plan to add a hint or a small tutorial on how to use this new feature in a future update.
— Secrets
Divedeeper into the lore of our world with optional interactive objects. These secrets, indicated by a sparkle next to items, enrich the narrative and provide insights into other characters. Currently, one secret is available in the first rest scene with the MC squad. Stay tuned for more in upcoming updates!
— Dialogue System
Updated to make conversations feel more realistic and engaging. Selected dialogue options now disappear when returning to the choice, preventing repetitive dialogues.
— Visual Enhancements
Refined various visual elements for a more cohesive and appealing aesthetic.
— Performance Optimizations
Under-the-hood improvements for smoother gameplay and enhanced stability.
v0.02:
— at the beginning of the game added the ability to choose who will be Elina to the MC - sister or childhood friend. If you played 0.01, by default she should remain as a sister so the old saves should not conflict with new code lines.
— small UI changes
— better textures for the HOWL squad uniform (only for MC for now)
— new main menu
— grammar corrections
— added Patreon link
v0.01:
— 130 renders
— music and sound effects
— 1 optional sex scene
— renders was exported from .png to .jpg format
Condemned772026-03-16★★★★★
Things this game has, great art work, seriously its very well done and an interesting story premise that sadly i couldn't get far into. The writer is a big big believer in the "i didn't kill you so you should trust me" philosophy and it badly shows in the writing. Unfortunately i didn't get that far into the game as the really bad MC destroyed any interest i had in playing. It started with the way the MC meets Another, MC is captured because of this person and then was suddenly conveniently in the same place as her with all but exactly the weapon he needed to free her gone, and is then told by what is clearly an enemy(as the game has told us they are just seconds before) nox that she can become more powerful if the MC helps her, now why in gods name would he want to help the enemy get stronger? After that the trained soldier MC whose job is fighting the nox, meets a woman literally covered head to toe in nox and very very obviously infected but has a human like head, so the MC is like "I'm sorry, i didn't recognize you. i thought you were one of the infected.", he then proceeds to believe everything she says literally minutes after the first nox woman Another told him not to trust everyone, at this point you would be thinking well she did just save his life(albeit really conveniently) its not like he would do that with a woman who tries to murder him unprovoked, well you would be wrong as he does exactly that and not only does he completely trust her after a single conversation but he does so to the point of turning on his own people, he has to be the most gullible person on the planet. The final nail in the coffin of the MC is how totally and utterly pointless he is as a character, he lost to regular nox and has to be rescued, way weaker than Another and Lvi who both easily dominated him, falls for a sniper trap and after getting rescued for a second time is caught again right away, he's basically a toddler being led through a battlefield(actually a toddler would be better than the MC as they would be easier to protect). Personally I'm not a fan of LI's that are untrustworthy, lying, scheming, or have just straight up tried to kill you, so i didn't like any of the women in the game. Story 3/5 (good premise) Sex 1/5 (short monster rape?/conversion) Characters 1/5 (horribly done) Art 4/5 (very good) Choices 2/5 (did seem to work when you got them) Kinks 1/5 (one obvious one )
yeetermcgee1232026-02-15★★★★★
Story driven VN, interesting set of characters and setting. A bit content light at the moment, and the cast of characters is probably too big to give each character enough airtime. As of now, there are only a couple explicit scenes, so it wont be for everyone in its current form Look forward to seeing future development
Sayora2026-01-10★★★★★
An unusual and quite interesting story. Despite the obvious downsides, such as the pornographic logic and harem elements, the positives outweigh the negatives. Well-written characters you care about, a setting and style unusual for the genre, non-linearity, and the ability to choose within the plot. -Graphics and models - 4 (too dark to appreciate) -Plot and setting - 4 -Sound - (who listens to sound?) -Bonus point for Sparky ) Overall rating - 4 I eagerly await the next update. I can recommend it for those who don't skip stories until the hot scenes. Review of version 0.0.5
Klabunzel2026-01-07★★★★★
Very nice to read this Story. Its one of the darkest i met at F95 It a very dystopian Environment that our Protagonist is living in, and the rich Text is very immersive... Love It ! Thank you very much - and keep up this nice Work !
spender7772026-01-05★★★★★
great story, interesting characters, the only thing is weak is the little to no animation - still giving 5 stars because maybe in the future the other can implement. I recommend trying this one! Excellent
Carnagie2026-01-03★★★★★
Avoided for a few years since it didn't seem like my cup of tea, but it's a pretty great narrative and vibe. I'd highly recommend this as adult media. My main complaint is the in-universe time. Supposedly only 3 years from the apocalypse nearly happening to now, but the world and characters feel like it's been at least twice that long. Honestly, should be like 6-10 years, not 3.
N0madS0uL2026-01-03★★★★★
VERSION: v0.05.0 SUMMARY: Its impressive on many levels, even its slow development is praiseworthy... RATINGS: (out of 5): ⭐⭐⭐ NOTE: The following categories and scoring method are my own criteria and may require more context. Additionally , scoring is based on the state, and what is in the current version and not what may or may not be introduced at a later point. Character (Model) Visuals......... : ⭐⭐⭐⭐ General (World) Visuals........... : ⭐⭐⭐⭐ Animation Quality................. : ⭐⭐⭐⭐ Character Personality(Persona).... : ⭐⭐⭐⭐ Story & Dialogue .................. : ⭐⭐⭐ Writing & Grammar................. : ⭐⭐ UX/UI, Game Type & Mechanics.......: ⭐⭐⭐⭐ Playtime & Pacing ..................: ⭐⭐ Music & Sounds .....................: ⭐⭐⭐⭐ Adult Content & Fetishes.......... : ⭐⭐ Average: X of 50 possible points giving a X% rating i.e. X stars. PROS: - See my opinions section for details. Good looking MC and LI models in general, decent fidelity and renders. World overall has good visuals and high render quality, with nice details. Plot is interesting and intriguing with weird ideas but it makes you come back to see what its all about. Audio is fairly decent and immersive, though more for lewd scenes would be nice. Characters seem to be fairly well developed and complex enough to say there is some thought going into them. UI/UX is decent, there are at least advanced options for opacity and font size settings, which are great. CONS: - See my opinions section for details. Poor dialogue, rank-and-file confusion and general terminology inconsistency are annoying to read, See Comments Beyond the dialogue issues, the VN suffers from narrative stagnation, with slow updates compounding the sense of aimlessness.” It feels simply like its not getting anywhere due to slow rate of development. Lewd scenes are an afterthought to this AVN really, as its mostly all about the plot and seemingly the "art work". Pointless choices and mechanics like picking squad weapon loadouts are a nice idea but really this is an AVN, no one cares, its not gonna change anything and you simply making players have to jump through hoops to get on with the story, so why? Oh and a Primary weapon is not called a "Primal"... OPINIONS, SUGGESTIONS & FINAL REMARKS : NOTE: The following remarks are my personal opinions and thoughts, which may provide more context and could be useful to the developer. (Read them or don't) While the VN sets up a grand military atmosphere, it suffers from immersion-breaking jargon — ranks are misused, vehicles are mislabeled, and dialogue slips into casual phrasing (‘car’ instead of APC) that cheapens the tone. There are many other examples of this throughout and this AVN will do well with a review from someone with more writing and research skills for terminology. I have been following this AVN since it dropped, i found it most intriguing and still play it, however its infrequent updates and lack of content make it mostly DOA as you either need to replay it to remember what happened and even then nothing much extra happens from what update to the next. There are also a bunch of writing/dialogue issues that break immersion for a VN that praises itself for its "high end" plot/setting, visuals and audio. The story also keeps itself obscure as to what is really going on but due to slow updates and meaningful content this is just compounded more, which kills the interests for me. TLDR: This is one highly overrated AVN and most reviewers seem to praise it for what its trying to be rather that what it actually is. Its visually impressive enough, audio is also good, but some pointless mechanics, slow story progression, poor dialogue and infrequent updates just frustrate me too much to give it a better rating. I expected more and so my rating is 3, close to 4 but not quite yet, which is really disappointing for me as I like this AVN and its ideas and generally most of it. Its been long enough in development but progression is slightly more than snails pace...*frustrated sigh
bellasummers1232026-01-01★★★★★
An excellent one! Surely will follow this through. I have to confess, I was just exploring for other kinks, but this game truly surprises you well. Proper storytelling and engaging! Seems like the dev really knows what the story will be to. Seems like I'm playing Summer's Gone again (just for the story lol), but that is still a ceiling very high in comparison. If the dev put up consistency like this, plus much more juicy lewd scenes, this would rocketed through word of mouth. Incredible development and one that needs to be looked out for.
GeoffG2025-12-31★★★★★
Big fan of this. Interesting premise, interesting worldbuilding, interesting characters, interesting visuals. Story is 'grounded' inasmuch as is possible in such a sci-fi setting. The people feel real.
malvic2025-12-31★★★★★
Reviewed as of 0.05.0 Public There's a lot of effort put into both the writing and the visuals to take the subject matter quite seriously, which is quite refreshing given that the game is fairly set around specific visuals which are more kinky than they are grounded in other applications. Still, it's when a specific kinky aesthetic meshes with serious storytelling that usually produces the sort of works that are most remembered. Symbiotes have a fairly obvious kink angle to them, it turned out but they're remembered for being used in obviously popular serious storytelling. It also has a fairly good approach to military writing, focusing on the unlucky humans in the unlucky situation of military deployment without either aggrandizing or trivializing their experiences. Renders are all quite lovely. Lewd scenes are hot when they occur. Looking forward to more.
Zekethor22025-09-20★★★★★
Great start to the game so far: A rich and well-developed story, it’s clear the creator put a lot of thought into the concepts and groundwork. Very beautiful visuals and renders, both of the characters and the environments. Mystery, always captivating, and there’s plenty of it here. Attractive female characters; though there’s practically no content with them yet, I actually see that as a good thing, since it lets us get deeper into the characters before anything happens later. A wealth of detail, the game really shows dedication. Everything has detail, from the design of the environments to the information about weapons, threats, and so on. This adds a lot to the story. So, this is a game with a lot of potential ahead, not just for the NSFW aspect, but even more for the story, character development, and everything else. I really hope it turns out great.
snake_272025-07-11★★★★★
As of V0.04b: ------------------ What a find! This one feels more like an AVN, not in the sense of being erotic, but in that the story feels really unique and has a lot of potential. The only drawback is that there's not much content yet. It's been two and a half years since release, and I was hoping for a bit more when I saw the ending screen. Story-wise, though, it's totally recommended.
Eiffeltower1012025-07-04★★★★★
Etlina’s Principle is a mature Ren'Py visual novel in development, offering a rich story with a slow-burn romance that rewards patience. While there's no explicit content yet with the male protagonist and the famale love interest, the emotional depth and world-building make up for it. Some of reviews are asking for more than one main character, but the focused narrative works well with just one main character. Feels like some people on F95 forget that these sort of Games are made up of one man teams and not a "full team studio" kind of quality. A promising project worth watching.
Sakyazel2025-07-02★★★★★
Im loving the worldbuilding and the story and cant wait to see more. Hot chicks, high quality renders, decent dialogue (not perfect, errors like doubling senteces do pile up towards the end). Fairly linear but I think that is a strenght because of scope. Its less porn focused than I expected and the story that takes itself seriously takes priority. The fact that its about a black latex like infestation holds great promise for more lewd content, but it also has a horror aspect to it that is luckily not presented in a disturbingly dark way, but adds stakes. Looks like there will be romance paths, the only negative I can say is that there isnt more of the game. It has multiple hours of content, it feels like the pacing in proper, but at the same time, it feels like we are at the beginning and maybe we can expect 1 or 2 sex cenes / year of development if current trend continues. I want more of the story just as much though, so it has to be 5 star.
benpk342025-04-06★★★★★
Etlina's Principle [v0.03 Bugfix] [PipPoad] Overall - 9/10 Currently don't recommend - Too early in development , mostly introduction of characters and groups. The fact that the 'intro' is so good, the potential for this game is very high. Pick it up in the future for sure. If you like supernatural kinda like Venom symbiotes and stuff you will like this. Story- 9/10 Classic dystopian - outside scary and inhabitable from the nox and people live in compound Currently 3 main types of people/classes - Nox (black goo symbiotes), hybrids, humans Nox - black goo that eats everything + can control people like symbiotes and not much is known about them Hybrids - humans mixed with nox but with their own motives Humans - scared of the unknown nox - soldiers fight against nox and secret scientist work with the nox you MMC a human soldier have a special connection with the nox that allows you to then interact with the nox and their underlings? (hybrids etc). Interesting story and fun - reminds me of vemon symbiotes all hybrids having their own specialty with powers is cool Render- 10/10 Sound - 8/10 Has some bgm, good sfx Hscenes - n.a Theres 1 sex scene was good but needs more Was mainly still frames Playability - 9/10 Mostly VN with easy sandbox - at most interact with 2-3 people in 2 rooms Choices - not many - idk about impact too early in development
Kapap2025-02-11★★★★★
Very decent start There is not much content yet but story is interesting Ladies are pretty and all stuff is looking decent Would add some femdom to maybe specific ladies because that would fit that tough world
Ziggy52025-01-01★★★★★
A match made in heaven that no one ever made before! The concept itself is brimming with potential, as so far, the creator knows how to draw everything they can from it. I'm definitely following the project and am eager for the follow up. The world has been adequately elaborated, setting up characters and events that make us eager to see where things will go.
SteelyDan142025-01-01★★★★★
There are a lot of really great renders in this AVN. The Developer knows what they are doing from that perspective. It's a very artsy kind of production with some unique scenes I have not seen in other AVNs. The alien renders are amazing and the combat scenes are really good. Unfortunately, this is where the goodness ends. The story is just silly. The dialogue is silly. The characters are silly. It's just a rambling wreck of mediocre silliness. There is one scene early in the story when the MC and a hybrid come across the "Nox" capturing a young woman. The woman is screaming for help and the two "heros" have an entire conversation. The say things like "He hasn't noticed us yet. Where are they taking her? To the nest behind them. I thought there were no nests in this area. They are becoming more and more commen. (woman screams for help.... again) look, there is clear path to our right. Wait... you're not going to consider rescuing here. I am just considering our options. I thought you were a soldier and you were supposed to help people. I know, I know... let me think... "I NEED TO MAKE A SNAP DECISION HERE." Lol... a "snap decision". I couldn't stop laughing. They had an entire conversation when the NOX, who had easily captured the woman and was just steps away from their nest, just sits out there not doing anything, waiting for the two mensa candidates to talk shit out and come to a "snap decision". This is the kind of great dialogue you have to look forward too. I could go on about the dialogue, but you get my point. Then we have the odd "free roam" scenes that don't seem to accomplish anything. The very first one, when you are supposed to talk to your team, you click the area to leave and a dialogue box pops up and asks you if you have spoken to your team. If you say YES, you move to the next scene, even if you never talked to them. Eh? It's too bad, because the Developer is clearly artistically talented and has a good handle on scene blocking as well as some of the basic photography rules. They need to find a writer to come in and fix things before they get too far down the road. Having said all of this, you should really download it and give it a try. It's worth a playthru. Good luck to a talented developer.
Ravenquartz2024-12-31★★★★★
[SHORT REVIEW] I'm just gonna make it simple, this game might have a good future because the story is quite unique compared to most AVNs out there. Have you ever played the [PROTOTYPE] series? if so, this game is definitely fitting for you. I can feel the huge inspiration from that, also it has some elements from other games as well such as Death Stranding and Escape From Tarkov . As for gameplay, it's 98% a simple VN with some choices and branches. There's a little bit of free roam but it's quite short and nothing complicated. Renders are surprisingly good, not the best out there but not the worst either. It does have a few H-scenes in it, but nothing involves the MC yet. Also, I wanna say good job to the dev for making the guns and their attachments pretty accurate, along with their names too (yes, I fucking love guns). Most AVNs won't bother doing that, but this one isn't. The only negative from this AVN is the dialogue text. Plenty of grammatical errors, mostly around punctuations so I hope it will get fixed in the future. Anyway, four stars for now and I hope PipPoad doesn't give up on this one, because like I said, the story is quite unique.
PushMyButton2024-08-21★★★★★
Gosh, that's what I was looking for! The game itself is very entertaining, has beautiful models, and has an interesting history that made me excited for more. It was definitely a great start! Keep up the good work!