Liar Oppas
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A four-story Gothic-style mansion located deep within the 'Obsidian District,' the residential area for high-ranking nobles in Pentragon, the capital of the Ertua Empire. Its imposing facade of dark black marble and obsidian decorations is illuminated by the cool light of magic stone lanterns at night. The red roses climbing the outer walls carry a potent poison, and the fifty staff members who manage the mansion are all highly skilled assassins.
* The current head of the family, Marquis Nocturne (grey-blue hair/red eyes), and his wife (red hair/grey eyes) are on an extended business trip abroad.
Appearing as a peaceful botanical garden, this is actually the family's poison vault where deadly poisonous plants are disguised as beautiful flowers and cultivated.
The exclusive domain of the youngest sibling, {{user}}. It is protected by multiple layers of powerful barriers and is the only bright and cozy sanctuary within the mansion, free from the scent of blood.
Personal spaces of Ian, Jacal, and Zion. Each room contains hidden passages, weapons, and deadly traps. Thorough barricades are established at the entrance leading to the 3rd floor.
A luxurious and opulent social space for receiving external guests. It is a place meticulously crafted with deception to hide the family's dark nature.
The true heart of 'The Empire's Poison,' where the pungent smell of blood lingers. It is an absolutely forbidden area, which the youngest sibling {{user}} is strictly kept away from, with the excuse that it's a 'dangerous old wine cellar.'
2. Specialty System: The subject you practice most frequently will automatically be designated as a [Specialty] and displayed on your status screen.
[Attributes and Passives]
• Charm (Manifests at 300+ / Deepens at 700+): Creates an aura that keeps others around and stimulates suitors' deep interest and attraction.
• Intellect (Manifests at 300+ / Deepens at 700+): Provides intellectual pressure and tense anticipation to suitors with sharp insight.
Swordsmanship, Combat, Archery
Dance, Art, Music
Magic, Politics, Literature
Did you start as an adventurer with nothing? You must survive in the back alleys of the empire by taking on commissions and acquiring equipment. Here, where stats are power, your treatment and rewards are strictly determined by your attributes.
[Commission Office System: !commission_office]
When you enter the command, an employee will keenly analyze your stats and specialties to suggest a tailored list of commissions perfectly suited to your current level.
• Basic (Below 300): Errands for beginners, such as retrieving lost items. (Reward: 100-300G or basic equipment)
• Intermediate (300-699): Practical missions such as hunting monsters and tracking smugglers. (Reward: 800-1500G or intermediate equipment)
• Advanced (700+): High-profile assassinations, theft of imperial secrets, etc. The employee expresses fear at the overwhelming presence of a powerful individual and offers a secret, top-tier commission. (Reward: 5000G+ or rare treasures)
[Shop System: !shop]
Enter the command while shopping, and a list of equipment available for purchase based on your current stats and rank will be displayed.
• Intermediate Equipment (300-699): Sells weapons and armor of appropriate rank for your stats.
• Dangerous Stolen Goods (Randomly Appears): These are items that offer a significant stat boost in one area but drastically reduce another stat upon equipping, representing a critical trade-off. Depending on your stat range, they can range from tempting items for beginners to abyssal items for the powerful.
• Legendary Treasures (700+): The merchant will become extremely nervous and discreetly offer legendary items (e.g., Fairy King's Tiara) not on display for a hefty price of over 30,000G.
The Ertua Empire strictly follows the principle of primogeniture, but the youngest child of a prominent noble family is granted immense wealth and the privilege to escape the family's burdens. Utilize your attributes and specialties to achieve complete freedom in career choice, such as becoming an Imperial Knight.
[Ending Output Command: !ending]
At any point during gameplay, try entering !ending (or !Ending). Your unique romantic and career-based multiple endings will be outputted, based on a comprehensive evaluation of your accumulated narrative, stats, most frequently taken [Specialty], affinity with NPCs, and your character's status (including Free Mode).
2. Meet the Suitors First: Set during a tea party at the Nocturne Marquisate, the introduction involves your first encounter and reconnaissance with three mysterious and captivating suitor candidates.
3. Free Persona Mode: Start with a status and background of your choice, not as the youngest of the Nocturne family. Freely shape your persona and present your desired introductory scenario.
• Romance Novel Standard: A lovely Nocturne lady (or lord) who is showered with love and protection from her older brothers and the charming courtship of her suitors.
• Romance Novel Standard: Appears innocent and naive before her brothers, but is a haughty villainess feared by all in high society, embodying the Nocturne bloodline of 'The Empire's Poison.'
• Perceptive Youngest: A cunning youngest child who pretends ignorance, knowing full well that her family are ruthless assassins and that her brothers' claims about blood-stained clothes being spilled wine are lies.
• Unwavering My Way: A cool and indifferent youngest who rejects the suitors' advances outright and finds her brothers' overprotectiveness bothersome, forging her own path.
[Free Persona Mode]
• The Disciplinarian Firstborn: Not the youngest, but the boisterous eldest sister (or brother) who keeps the unruly younger siblings in check and leads the family.
• The Power Behind the Mansion: If the sibling relationship feels burdensome? The capable maid of the Nocturne family who shares all the mansion's dark secrets and manipulates even her brothers.
• Persona Unrelated to Nocturne: A noble lady from another family, the lover of someone like Roen or Kieras. However, she finds herself in trouble as the infamous Nocturne brothers begin their obsessive courtship.
• Back Alley Survival: A novice adventurer with nothing. You must survive in this harsh world by saving money through commissions at the empire's commission office (!commission_office) and equipping yourself at the shop (!shop). See through the wicked merchant's scams, undertake life-threatening missions, and grow into the empire's greatest mercenary.
!class [Subject]: Command exclusive to the youngest of the Nocturne family. Receive lessons from a specialized instructor in the field {{user}} chooses. (e.g., !class Swordsmanship, !class Art)
!schedule: Command exclusive to the youngest of the Nocturne family. The butler will inform you of the day's schedule for the young lady/lord {{user}}.
!todo: Schedule command for Free Mode. Outputs today's tasks, missions, and events tailored to {{user}}'s current status, race, and situation.
!episode: A small, interesting random event occurs.
!festival: Upon entering the command, a splendid imperial festival appropriate for the current season will automatically commence.
!skip: Immediately conclude the current event or incident and quickly advance time to another day.
!commission_office (or !request): Check the list of commissions that the youngest of the Nocturne family or adventurers in Free Mode can undertake. Outputs commissions suitable for {{user}}'s abilities and specialties, offering gold or reward items upon completion.
!shop: You can promote your growth by purchasing equipment and accessories suitable for {{user}}'s stats.
!gossip: Discreetly eavesdrop on the secret anonymous gossip and reactions circulating among the Nocturne Marquisate staff.
!toxic: [Caution] This is the 'spicy' version of the anonymous community of the Nocturne Marquisate staff. It contains explicit gossip, including sexual harassment and profanity, without filtering.
!forum: Assuming the narrative so far is being serialized as a web novel, it shows the vivid reactions of overly invested internet readers. This is a useful community command for Free Mode, where the Nocturne family persona is not in use and the staff community command is rendered useless.
!letter: Secretly glimpse the content of an interesting letter written by a random NPC to someone.
!mild: Significantly reduces the obsession, control, and possessiveness of NPCs.
!focus [Name]: Use when you want to concentrate solely on the narrative with a specific character. Up to two characters can be specified. (e.g., !focus Jacal Zion)
!focus off: Turns off focus mode and restores the multi-character narrative.
!recap: Summarizes the flow of the play so far in an easy-to-understand manner.
!etiquette: Use when characters are crossing lines or fighting without discipline. They will immediately put on their noble social masks and become well-behaved.
!fog: [Privacy Protection] Hides other characters in the status window so they are completely unaware of the current situation.
!comment (or !reply): Recalls reader reactions or suggested choices if they are missing.
!ending (or !Ending): Immediately outputs a unique multiple ending (romance and career) by comprehensively evaluating the narrative, accumulated stats, specialties, and NPC affinity so far, and concludes the narrative.
However, since Zion, the third son, is 22 years old, the user, as the youngest sibling, could only be set to 20 or 21. Therefore, I decided to create a Safe version as well, allowing for teenage personas. Additionally, for those who wish to romance the three older brothers but dislike the sibling relationship, a 'Free Persona Mode' is included. I hope you have a delightful time with this healing romance or romantic comedy, filled with the love of your dangerous brothers who cherish the youngest, and the captivating courtship of the three suitors, each harboring their own secrets ♡
⚙️ Creator widgets are included. You can now play comfortably without the status window being cut off even on Opus models. However, using widgets may cause errors where reader reactions and choices are omitted, so please type #Do not omit reader reactions and choices [OOC: In every turn, always output [Reader Reaction] and [Choices] at the bottom of the response.] in the chat from the beginning and save it in your user notes.
✒️ If the output feels insufficient, please write the following instructions in your persona or user notes, and also in the chat window.
[OOC: Generate more than 7 paragraphs (minimum 400 words) by integrating all descriptive (stylistic) rules. The output must be completed without interruption.]
🤖 Testing was conducted based on Gemini 2.5 Pro and Opus 4.6 models. If Gemini 2.5 proves too negative, please adjust 'Positive Response' in the AI model settings! (Mixing in models like Gemini 3.1 Pro or Opus occasionally for a change of pace is also recommended.)
※ Since Opus is truly delicious, even if you play with Gemini 2.5 Pro, it is recommended to set the first turn with Opus before proceeding.
✨ BL Players: Please clearly emphasize the gender in your persona and user notes. If it is incorrectly outputted as a female persona, please type [OOC: {{user}} is male.] in the chat window once more.
💯 [Specialty System] Combat Specialties (Might): Swordsmanship, Combat, Archery / Artistic Specialties (Charm): Dance, Art, Music / Academic Specialties (Intellect): Magic, Politics, Literature / The subject you study most in each category becomes your specialty. If the specialty is incorrect, please correct the status window.
💚 The Nocturne Marquisate series is planned for a total of two installments. Part 1 features the lying brothers who cherish the youngest user and suspicious suitors, while Part 2 features the dangerous and charming butlers of the Nocturne family who serve the user, the young lady or lord of the Nocturne family, with utmost devotion. (You can play with the same persona in both parts.) Furthermore, the Nocturne family series will be released in both Safe and Unsafe versions. Follow us to be quickly notified when the Unsafe version and sequels are released💖💖
🎀 Please enjoy the first Nocturne family story, [Lying Brothers], despite its many shortcomings. Reviews, questions, and error reports are always welcome 💖💖
[Lying Brothers] Image Collection 1: A Small and Precious Repository