---
title: "Ninon the Upside-Down Mermaid"
description: "In the underwater kingdom of Cerebrite, there live several mermaid princesses. One of them is Ninon, who was born in a peculiar manner unlike the other merfolk:"
image: "https://t.vndb.org/cv/30/125630.jpg"
---

# Ninon the Upside-Down Mermaid

![Ninon the Upside-Down Mermaid](https://t.vndb.org/cv/30/125630.jpg)

**Developer:** Atelier in Wonderland

**Release date:** Apr 17, 2026

**Platform:** Windows, Linux, macOS, Website

**Language:** English

**Rating:** 5.7/10 (avg, 3 votes)

## Description
In the underwater kingdom of Cerebrite, there live several mermaid princesses. One of them is Ninon, who was born in a peculiar manner unlike the other merfolk: she had the head of a fish, and the legs of a human. As such, the other merfolk shun her, and she feels out of place amongst even her own family. 

Meanwhile, Ninon herself carries a desire to see the world beyond her home of the White Sea, a desire that is granted in a most unorthodox fashion on the night of her 21st birthday, in the form of a  chance encounter with a nobleman named Vivien Bellerose.

[From [itch.io](https://madame-photon.itch.io/ninon-the-upside-down-mermaid)]

## Characters
### Ninon
- **Gender:** Female
- **Alias:** Ninny
- **Body:** Pale, Scales, Fish Fins
- **Clothes:** Hair Ribbon, Skirt, Knee-high Socks, Wedding Dress, Blouse, Ribbon Tie, Veil, Puffy Sleeves, Mary Jane
- **Personality:** Low Self-esteem, Kind, Stubborn, Naive, Curious, Bookworm
- **Subject of:** Blackmail, Birthday Celebration, Discrimination, Attempted Homicide
- **Role:** Wife, Daughter, Princess, Based on a Fictional Character, Half-orphan, Older Sister, Merperson
- **Engages in:** Singing, Shapeshifting, Wedding
- **Eyes:** Pink, Round

### Octave Fontaine
- **Gender:** Male
- **Hair:** Blond, Waist Length+
- **Body:** Pale, Adult
- **Eyes:** Green
- **Role:** Husband, Divorcee, Wealthy
- **Subject of:** Wounding, Domestic Violence
- **Personality:** Kind, Protective, Henpecked
- **Clothes:** Cravat
- **Engages in:** Redemption

### Perle Fontaine
- **Gender:** Female
- **Hair:** Pink, White, Bun, Long, Shoulder-length, Gradient Colored Hair
- **Body:** Pale, Adult, Mole, Tiny, Makeup
- **Role:** Villain, Wife, Divorcee, Wealthy, Singer
- **Eyes:** Amber
- **Clothes:** Earrings, Evening Gloves, Strapless Dress, High Heeled Shoes, Beaded Necklace
- **Items:** Knife
- **Engages in:** Domestic Violence, Blackmail, Arson, Attempted Murder, Discrimination, Battery
- **Personality:** Arrogant, Short-tempered, Vindictive, Dishonest, Cruel
- **Subject of:** Arrest

### Vivien Bellerose
- **Gender:** Male
- **Hair:** Black, Long, Parted in Middle
- **Eyes:** Brown, Itome
- **Body:** Young-adult, Dark, Freckles, Androgynous
- **Clothes:** Vest, Boots, Ribbon Hair Tie, Loose Ribbon Tie
- **Role:** Husband, Son, Noble, Pianist, Older Brother
- **Subject of:** Wounding, Domestic Violence, Birthday Celebration
- **Personality:** Altruistic, Refined, Religious, Workaholic, Family Oriented
- **Engages in:** Wedding, Suicide Attempt

### Amadeus
- **Gender:** Male
- **Hair:** Moustache
- **Eyes:** Black, Round
- **Role:** Butler, Non-human
- **Clothes:** Monocle, Bow Tie
- **Body:** Tiny, Non-Humanoid

### Anya Earnshaw
- **Gender:** Female
- **Hair:** Blond, Bun, Shoulder-length, Hikimayu
- **Eyes:** Blue
- **Body:** Overweight
- **Clothes:** Glasses, Maid's Dress, Maid's Headdress, Mary Jane
- **Role:** Maid

### Lorelai
- **Gender:** Female
- **Hair:** Waist Length+, Elemental
- **Body:** Pale, Giant, Makeup, Fish Fins
- **Eyes:** Violet, Pink, Central Heterochromia
- **Personality:** Stoic, Misanthrope
- **Role:** Widow, Mother, Queen Regnant, Merperson
- **Clothes:** Forehead Necklace

### Millie
- **Gender:** Female
- **Alias:** Mimi
- **Body:** Pale, Short
- **Eyes:** Green
- **Clothes:** Dress, Gloves, Bow Tie
- **Role:** Daughter, Princess, Based on a Fictional Character, Half-orphan, Younger Sister, Merperson
- **Personality:** Immature
- **Hair:** Blunt Bangs, Orange

### Petraea
- **Gender:** Female
- **Hair:** Blue, Wavy, Shoulder-length
- **Role:** Magician, Based on a Fictional Character, Non-human, Pet Owner
- **Eyes:** Hidden
- **Body:** Unnatural Skin Tone, Makeup
- **Personality:** Strange, Cheerful
- **Clothes:** Strapless Dress, Veil, Witch Hat, Poncho

### Undine
- **Gender:** Female
- **Personality:** Stoic
- **Body:** Fang, Fish Fins, Non-Humanoid
- **Role:** Pet, Fish
- **Eyes:** Permanent Blank Eyes

## Shops
- [Itch](https://madame-photon.itch.io/ninon-the-upside-down-mermaid)

## Releases
### English
- **2025-09-21**: Ninon the Upside-Down Mermaid  - Extended Demo
- **2026-04-17**: Ninon the Upside-Down Mermaid - [Itch.io](https://madame-photon.itch.io/ninon-the-upside-down-mermaid)

## Tags
Protagonist's Sister as a Support Character, Discrimination, Princess Protagonist, Merprotagonist, Mother Support Character, Dark Skinned Hero, Female Protagonist, ADV, Otome Game Jam, France, Hero with Freckles, Only a Single Hero, Protagonist with a Sprite, Fairy Tale, Protagonist with a Face, Only Adult Heroes, Adult Protagonist, No Quick Save/Load, Unoriginal Soundtrack, Attempted Suicide, Major Antagonist, Butler Support Character, Instrumentalist Hero, Love Overcomes All, Fish, Marriage Ending, Late Branching Plot, Few Choices, Blackmail, Bad Endings with Story, Varied Title Screens, Bloody Scenes, Descriptions of Violence, Parting Ending, Side Portraits, Ambient Sounds, Mid-game Videos, Only One Bad Ending, Only One Good Ending, Super Deformed CGs, Musical Themes, Half-orphan Protagonist, Other Perspectives, Noble Hero, Androgynous Hero, Interracial/interspecies Romance

## More Games from Atelier in Wonderland
- [Rosetta and the Well](https://pinovel.net/v44388)
- [Snow Angel and Silver Devil](https://pinovel.net/v48938)
- [Ninon the Upside-Down Mermaid](https://pinovel.net/v58317)
- [Anemone Questionnaire](https://pinovel.net/v67262)

---
*View the full details at [pinovel.net/v58317](https://pinovel.net/v58317).*

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