
In a city where power is measured in secrets, Kate Adler is no stranger to deception. A sharp-witted investigator with a talent for navigating lies, she's handed a rare lead, an invitation to Nocturne, the clandestine club where the elite shed their masks and morality.
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About
In a city where power is measured in secrets, Kate Adler is no stranger to deception.
Your Story, Your Choices, Your Gameplay
A sharp-witted investigator with a talent for navigating lies, she's handed a rare lead, an invitation to Nocturne, the clandestine club where the elite shed their masks and morality.
But Nocturne is just the beginning.

What starts as a simple surveillance job unravels into a deeper conspiracy, missing girls, falsified identities, and a city stitched together by corruption. From neon-lit penthouses to sewer tunnels, Kate must follow the clues through every layer of society’s rot.

Every lead is a choice. Every truth, a risk.
And the deeper she digs, the more Kate realises: she might not be the hunter after all.
City of Sin – The Nocturne Files is a choice-driven visual novel that blends investigative gameplay with narrative branching.
You’ll uncover clues, question motives, and decide who Kate can trust as you navigate a world where every decision has weight.
Gameplay Overview
🔹 Choice-Driven Storytelling: AVN branching dialogue options and player decisions that shape Kate’s path and relationships.
🔹 Multiple Endings: Outcomes vary based on your choices, from investigative success to moral downfall.
🔹 3D Visuals: High-quality DAZ renders and immersive lighting that bring each environment and character to life.
🔹 Interactive Exploration: Investigate scenes, follow leads, and uncover hidden truths through narrative choices.
🔹 Mature, Emotional Themes: Power, manipulation, desire, and consequence are explored through adult storytelling.
🔹 Episodic Expansion: Regular free updates continue Kate’s investigation and expand existing routes no paid DLC or hidden content.
Summary
Genre: Narrative / Visual Novel / Mystery
Themes: Investigation, Corruption, Adult Choices
Mode: Single-player
Content Updates: Free episodic expansions
Ongoing Support & Content
This release includes all currently playable chapters and major branching routes.
Future updates will add new episodes, scenes, and endings all included with your purchase at no additional cost.
No microtransactions, no paywalls, just an expanding world shaped by your choices.
Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Languages: English, French, Italian, German, Spanish - Spain, Russian, Simplified Chinese, Turkish
Engagement
Hours played at review time, across 31 reviews with recorded playtime.
Reviews
[h1]Concise Game Reviews: City of Sin – The Nocturne Files [Ep1][/h1] [i](Scroll down for the longer version)[/i] [table] [tr] [th][b]Game Value:[/b][/th] [td]✅ [b]Highly recommended for fans of slow-burn adult visual novels focused on mystery, power dynamics, and moral corruption in a noir-inspired setting.[/b] You play as Kate Adler, a sharp-witted private investigator navigating a city where influence is traded in secrets and desire. An invitation to the exclusive club Nocturne pulls her into a web of lies, missing girls, and elite corruption. Every choice you make shapes Kate’s relationships, her integrity, and how deeply she sinks into the city’s underbelly. [i]Will Kate uncover the truth behind Nocturne—or lose herself to the very forces she set out to expose?[/i] [/td] [/tr] [tr] [td][b]Adult Content Tags:[/b][/td] [td]✔Non-Consensual ✔Female Protagonist ✔Oral ✔Vaginal ✔BDSM ✔Dominance/Submission ✔Psychological Manipulation ✔Coercion ✔Sexual Violence (Story Routes) ✔Full Nudity ✔Shower Sex ✔Lewd Talk ✔Glory Hole ✔Bukkake ✔Abuse ✔Corruption ✔Humiliation ✔Lesbian Sex ✔Ryona ✔Masturbation ✔Sexy Lingerie[/td] [/tr] [tr] [td][b]Genre:[/b][/td] [td]A choice-driven adult visual novel with mystery and noir themes, where your decisions change story routes, scenes, and character outcomes.[/td] [/tr] [tr] [td][b]Censorship:[/b][/td] [td]None. All adult content is included as presented by the developers.[/td] [/tr] [tr] [td][b]Game Length:[/b][/td] [td]~2 hours for Episode 1; designed for multiple replays with future free episodic expansions.[/td] [/tr] [tr] [td][b]Challenge Level:[/b][/td] [td]None. This is a choice-driven visual novel where player decisions directly affect the FMC’s path and experiences, including who she meets (men or women) and what situations she is led into, encouraging multiple playthroughs to explore different routes.[/td] [/tr] [tr] [td][b]Graphics:[/b][/td] [td]High-quality 3D DAZ renders with strong lighting, expressive character models, and a neon-noir aesthetic. Erotic scenes are a mix of animated and static renders.[/td] [/tr] [tr] [td][b]Music & Voice Acting:[/b][/td] [td]Moody, atmospheric soundtrack that reinforces the noir tone. No full voice acting yet; narration and dialogue carry the experience.[/td] [/tr] [tr] [td][b]Technical Stability:[/b][/td] [td]Runs smoothly with no bugs encountered. The UI is clean and the save/load system works reliably, though a scene gallery is not yet available to revisit unlocked H-scenes.[/td] [/tr] [tr] [td][b]Replay Value:[/b][/td] [td]Solid. Episode 1 offers multiple branching choices that shape Kate’s investigation, including who she interacts with and how key situations unfold, leading to different scenes and encouraging replay to explore alternate routes.[/td] [/tr] [/table] [h1]Detailed Review:[/h1] [table] [tr] [th]🔑[b]Key Features:[/b][/th] [td] 🕵️ [b]Investigative Narrative:[/b] Follow leads, gather clues, and uncover secrets tied to the city’s elite and underground circles. 🌃 [b]Noir Atmosphere:[/b] Neon-lit locations, private clubs, and shadowy environments establish a strong noir tone. 🧠 [b]Choice-Driven Story:[/b] Player decisions influence dialogue, character interactions, and the routes available during the episode. 🔥 [b]Adult Themes:[/b] Power dynamics, desire, manipulation, and corruption are central to the story and its explicit scenes. 🔀 [b]Branching Routes:[/b] Episode 1 already includes multiple paths based on choices, encouraging exploration through replay. [/td] [/tr] [/table] [table] [tr] [th]🎮[b]Gameplay:[/b][/th] [/tr] [tr] [td] 🖱️ [b]Classic AVN Structure:[/b] Read the story, make dialogue choices, and progress through branching scenes. 🧩 [b]Player Choices:[/b] Decisions affect dialogue flow, character interactions, and which scenes become available. 🔁 [b]Route Variety:[/b] Different choices lead to alternate paths and scenes within Episode 1. 🎥 [b]Visual Presentation:[/b] 3D renders with cinematic framing and lighting support both storytelling and adult scenes. [/td] [/tr] [/table] [table] [tr] [th]🏆[b]Verdict:[/b][/th] [/tr] [tr] [td] City of Sin – The Nocturne Files [Ep1] offers a promising but measured introduction to an episodic adult noir visual novel built around investigation, secrecy, and player choice. Unlike the heroine from the developer’s previous game, Kate Adler is not portrayed as weak or passive. She is a sharp, capable investigator who knows how to navigate lies and blend into dangerous environments—but poor decisions can still leave her caught off guard or overwhelmed. The tension comes from risk and misjudgment, not helplessness. The story focuses on investigating suspicious disappearances rather than solving clear-cut crimes. Kate infiltrates dubious locations, poses as a client, and interacts with characters, both men and women, who are often deceptive or openly malicious. The city feels corrupt and layered, and the narrative steadily suggests that the deeper Kate digs, the more dangerous her role becomes. The noir atmosphere and narration do most of the heavy lifting, giving the episode a tone closer to an investigative thriller than a traditional AVN. In its current state, Episode 1 is fairly short and offers a limited but clear set of choices, roughly around ten, some of which remain locked in the choice menu until discovered through different routes. These choices include deciding who Kate interacts with and how she approaches certain situations, and they do affect the scenes that follow. While the amount of alternate content is still modest, there is enough variation to encourage replaying the episode to uncover what you missed. Overall, City of Sin feels like a strong foundation rather than a complete experience. It prioritizes setup, tone, and character over immediate payoff, with adult content used to support themes of power, manipulation, and consequence. With free episodic updates planned and a clear narrative direction, the game is undeniably promising, and it will be interesting to see how future episodes expand both the investigation and the scope of player choice. [/td] [/tr] [/table] [table] [tr] [th]✅[b]Good:[/b][/th] [/tr] [tr] [td] 👍 Strong noir atmosphere backed by solid writing and consistent narration 👍 Likeable, capable female protagonist with clear agency 👍 Player choices that affect routes and scene variations 👍 High-quality 3D renders with effective lighting and cinematic framing 👍 Helpful replay features, including a choice recap, gallery, and walkthrough menu 👍 Free episodic updates planned, with no DLC or paywalls announced [/td] [/tr] [/table] [table] [tr] [th]🛠️[b]Could Be Better:[/b][/th] [/tr] [tr] [td] 👎 Episode 1 is fairly short in its current state 👎 Limited amount of explicit content so far 👎 Slow-burn pacing may not suit players looking for immediate gratification [/td] [/tr] [/table] [code] [b][h2]Enjoyed the review? An upvote or award really helps![/h2] For further insights, join my [url=https://steamcommunity.com/groups/EdenGenesis]Steam group[/url], follow my [url=https://steamcommunity.com/groups/EdenGenesis/curation]curator page[/url], or connect with me on [url=https://x.com/EdenGenesisSC]X[/url].[/b] [/code]
I feel like I get scammed for wasting $10 on this game. Story was too short with a major lack of choice options and scenes
GAME IS SO SHORT IT MAKES ANY ♥♥♥♥ LOOK LONGER. Rated: 5 for that alone That and having the nerve to use a mimic of Lexi Diamante from Leap of Faith (a real game w story and everythin'). Unbelievable.
In City of Sin you’re dropped into a neon‑lit metropolis where secrets are the real currency and deception lurks in every alley. Our heroine, Kate, is a razor‑sharp investigator who’s just received a rare invitation to the underground Club Nocturne, a place where the city’s elite trade masks for raw, unfiltered desire. The story is tight, packed with twists, and the narration is so spot‑on it practically reads like a novel. The female characters are not only gorgeous but also full‑bodied, crafted to be as seductive as they are complex. First things first: this is a slow‑burn AVN that promises free updates with more episodes, so keep an eye out for that. The best thing about the game, aside from Kate being a goddess among mere mortals, is the narration (absolutely stellar). Not all the h‑scenes are animated, but they’re still incredibly erotic. There isn’t much action (it’s a slowburn), but the atmosphere is perfect for each scenario. I’m looking forward to the upcoming h‑scenes because they’re going to be intense, and I’m pretty sure they’ll deliver. The plot is intense, full of mystery, and it pulls you in right from the start. The script is well‑crafted and actually lightens up the reading experience. Gameplay is classic for the genre: pick a choice, watch the story branch, and see where it leads. If you’ve played other titles from DoAdventures, you’ll notice City of Sin is a clear step up in quality. All in all, City of Sin is a must‑play for lovers of slick narratives and steamy thrills. Kate Adler’s world is as captivating as it is erotic, the h‑scenes keep things juicy without feeling over‑the‑top, and the game’s slow‑burn pacing lets you savor the tension. Highly recommended! [code]Love NSFW Games? Follow my [url=https://store.steampowered.com/curator/44896253/]Curator page[/url] For the hottest recommendations![/code]
Not enough sexual content and far too short for €10 (as of v 0.1.) Let's hope the developer will stay true to his word and release the rest!
This AVN story is a slow burn at first but the story does pick up and gets more interesting as things play out. At this time (Ep1) this should take you about 2 hours or so to play through however depending on the choices you make it could be less then that. There's music to listen to, some sexual animations but no sound with them at this time nor any voices during the story. This is meant to be play at least 4 different times eventually have a different out comes in the long run. I paid full price for this and this dev has made other good AVN's you should also check out if you have the chance.
《City of Sin - The Nocturne Files [Ep1]》(罪恶之城 - 夜曲档案 [第一集])是一款由“DoAdventures”独立制作并发行的欧美成人视觉小说,这个制作组之前还发行了也是欧美成人视觉小说的《Jessica's Choices - Origins》,所以在黄油技术、建模这方面比较有质量保障的。实际上,这作的角色建模进步非常大。 游戏暂时没有中文,我是用汉化工具玩的。大概的剧情为,玩家扮演了一位叫做“凯特”女角色,她是一位机智敏锐的调查员,因为得到了一些线索于是进入一个秘密俱乐部进行调查。但这次简单的行动却随着调查的深入,逐渐揭开一个隐藏在表面下的阴谋。凯特需要一步步的追查下去,直至挖掘出这个腐败事件的真相。 游戏是经典的选择驱动视觉小说玩法,在推进剧情的过程中会有很多选项让玩家选择和决策,从而影响后续的故事发展,也会导致走向正义调查成功或者道德沦陷失败的几种不同结局。游戏暂时还只有第一集的内容,后续会定期的免费更新内容。 游戏在涩涩方面是比较棒的,无论是角色建模的颜值、妆容、身材、服装(特别是游戏中有很多的内衣、高跟鞋、指甲油等要素)等等,非常的性感和有诱惑力。涩涩的场景比较频繁。游戏中的XP除了常规的那些外,还包含了捆绑、乳环、人前,以及女性主角最常见的百合要素。这家制作者挺喜欢这个XP的,之前的作品也是。不过本作里美女贴贴也让人喜欢就是了。CG图片和H动画目前并不多,还要看后面的更新,不过是骑兵无码。比较可惜的是游戏没有配音以及涩涩音效,少了些味道。 期待后续的更新,最好能加汉化以及配音。 [quote]关注鉴赏组:[url=https://store.steampowered.com/curator/45134494]浮生评测[/url] ←"浮生若梦,一鉴倾心,邀您共赏人间烟火" 加入Steam组:[url=https://steamcommunity.com/groups/LLFLLFF]浮生评测[/url]←“一起追寻'浮生若梦'般的游戏体验” 开始“浮生若梦”鉴赏组的奇幻之旅、[/quote]
Набор изображений низкого качества ( в 50 % случаев в полумраке) где ничего не разобрать , с описанием того, что вы наглядно видите , больше здесь ничего нет. Вся история на 50 минут, да и истории толком нет.
City of Sin - The Nocturne Files [Ep1] ? Une MC polymorphe aux multiples visages et à la consommation d'eau excessive #balancetadouche. De Lexi (Leap of Faith) à Jessica (Lust Theory), de Tara (Thot on Trial) à Marianne (Having a HARD Time), et j'en oublie probablement d'autres : cet AVN n'a aucune identité propre ! 🔴🔴🔴🔴⚪️⚪️⚪️⚪️⚪️⚪️ Ma note : 49/100 [table] [tr] [th]Les (+)[/th] [th]Les (-)[/th] [/tr] [tr] [td]Jolis corps[/td] [td]Super court[/td] [/tr] [tr] [td][/td] [td]Qualité d'image[/td] [/tr] [tr] [td][/td] [td]Visages polymorphes[/td] [/tr] [/table] Super court AVN avec beaucoup de blabla : malgré de jolis corps et une ambiance de FTV Girls à Mommy's Girl, City of Sin - The Nocturne Files [Ep1] est ludiquement précoce avec des décors vus et déjà-vus. Qualité globale des images très moyenne avec des animations fortement médiocres : expositions et ombres ratées. Effort sur le côté vestimentaire, la lingerie et les talons, mais insuffisant pour aimer cet AVN. 10,79€ ? Trop cher ! 🔴🔴⚪️⚪️⚪️ Rapport qualité/prix 🔴🔴🔴🔴⚪️ Fidèle aux images de vente 🔴🔴🔴⚪️⚪️ Expérience vidéoludique 🔴🔴⚪️⚪️⚪️ Durée de jeu 🔴🔴🔴🔴⚪️ Gameplay 🔴⚪️⚪️⚪️⚪️ Captures d'écran prises 🔴🔴⚪️⚪️⚪️ Images, esthétique 🔴🔴⚪️⚪️⚪️ Tonalité, colorimétrie 🔴🔴🔴⚪️⚪️ Modèles féminins 🔴🔴⚪️⚪️⚪️ Têtes, visages 🔴🔴⚪️⚪️⚪️ Expressions, attitudes 🔴🔴🔴🔴⚪️ Vêtements, tenues 🔴🔴🔴🔴⚪️ Lingerie, bijoux 🔴🔴🔴🔴⚪️ Talons hauts, bottines 🔴🔴⚪️⚪️⚪️ Qualité du contenu +18 🔴🔴⚪️⚪️⚪️ Quantité du contenu +18 🔴⚪️⚪️⚪️⚪️ Fluides, sécrétions 🔴⚪️⚪️⚪️⚪️ Animations, transitions 🔴🔴⚪️⚪️⚪️ Histoire, récits 🔴🔴⚪️⚪️⚪️ Choix narratifs Est-ce que je recommande City of Sin - The Nocturne Files [Ep1] ? Non.
[h1]City of Sin - The Nocturne Files [Ep1][/h1] [b] [h3]Game Introduction[/h3] Game Story Synopsis:The player plays as a female investigator named Kate. Due to the disappearance of several women in the city, including a female benefactor of a certain foundation, Kate's organization becomes concerned and sends her to investigate a club owned by a senator, where she uncovers hidden secrets.... [h3]Gameplay[/h3] As a visual novel, the game is presented almost entirely in the visual novel format, featuring numerous choices for players to make. Players will be asked to make decisions such as whether to trust certain characters, which will trigger different story paths (and likely lead to different endings in future updates). The game also incorporates mobile phone functions at certain plot points, which, although brief, enrich the presentation. A story skip function is also available in the settings. Overall, it's quite good. [h3]R18 section[/h3] Regarding the R18 content, the current EA version of the game includes approximately six animated scenes related to the storyline. All erotic scenes are static differential images with a moderate duration. The game currently lacks voice acting, but the background music is quite good. The character illustrations and models use a realistic 3D style, which I really like. The game's R18 tags include: oral sex, masturbation, fellatio, breast sex, lesbianism, and prop-based BDSM. No additional patches are required, and all CGs are uncensored. Overall, although the number of CGs is relatively small, the character art style is excellent, and further updates are planned. Considering the price, this game is still very worthwhile and a good game for self-pleasure. [h3]summarize[/h3] Overall, this game is currently a short visual novel in the Early Access stage. The multiple branching storylines are quite good, and although there are few explicit scenes and no voice acting at this stage, the game will continue to be updated. If you enjoy a rich story, you might want to give this game a try.[/b] [h2]Game recommendation rating: 7/10❤️[/h2] [quote] I'm the guy who specializes in reviewing R18 games. If you're interested, please join us![url=https://steamcommunity.com/groups/R18GMER]R18 Recommender[/url],I am dedicated to helping everyone understand what makes a game fun. [/quote]
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