---
title: "Princess X ~Boku no Iinazuke wa Monsterkko!?~"
description: "Shinichi Mikuriya's average life takes a turn for the weird when his dad drops a megaton bomb - he's engaged! To multiple women! And they aren't even human!  Sh"
image: "https://t.vndb.org/cv/85/89185.jpg"
---

# Princess X ~Boku no Iinazuke wa Monsterkko!?~

![Princess X ~Boku no Iinazuke wa Monsterkko!?~](https://t.vndb.org/cv/85/89185.jpg)

**Alternative Title:** プリンセスX ～僕の許嫁はモンスターっ娘!?～

**Aliases:** Princess X: My Fiancee is a Monster Girl?!, Princess X

**Developer:** Poison@Berry

**Release date:** Sep 22, 2011

**Platform:** Windows

**Language:** English, Japanese

**Rating:** 5.9/10 (351 votes)

## Description
Shinichi Mikuriya's average life takes a turn for the weird when his dad drops a megaton bomb - he's engaged! To multiple women! And they aren't even human!

Shinichi Mikuriya had an ordinary life with his two cute, cheeky little sisters and his borderline psychopath of a childhood friend. Then one day his absentee father called with news. His father had been up to some business and he’d needed a bargaining chip, so now Shinichi has a fiancée!

A beautiful lamia girl from an extremely dangerous military empire, and she even seems to like him. Plus, she’ll destroy the world if he doesn’t marry her.

More news from Dad. It turns out he’s been making a lot of very profitable deals... An innocent centaur knight, a sassy machine princess, and an airheaded arachnid aristocrat join Shinichi, his sisters, and the lamia empress-to-be in his home. They’ll destroy the world if he doesn’t marry them, too. Except the spider girl – she’ll just kill herself instead. 
Shinichi’s life has gone from ordinary to powder keg. What wacky misunderstandings, intense adventures, and incredible insertions lie ahead?!

## Characters
### Nadius the 12th (ナーディウス12世)
- **Gender:** Female
- **Aliases:** Naja, ナージャ
- **Measurements:** Height: 169cm, Bust-Waist-Hips: 96-58-85cm
- **Hair:** Violet, Waist Length+, Straight, Spiky Bangs, Sidehair
- **Body:** Teen, Slim, Pale, Tattoo, Nail Polish, Fang, Forked Tongue, Bat Wings, Long Tongue, Reptilian Tail, Ram Horns, Big Breasts
- **Role:** Magician, Betrothed, Daughter, Princess, Dragon, Snake Person
- **Eyes:** Amber, Tsurime, Slit Pupils
- **Personality:** Deredere, Possessive, Yo
- **Clothes:** Collar, Detached Sleeves, Bracelet, Pendant Earrings, School Swimsuit, Crop Top, Sailor School Uniform
- **Engages in:** Shapeshifting, Bunnygirl Cosplay, Magic/ESP Combat
- **Subject of:** Resurrection
- **Voiced by:** Oukawa Mio

### Proxima (プロキシマ)
- **Gender:** Female
- **Aliases:** Proko, プロ子
- **Measurements:** Height: 162cm, Bust-Waist-Hips: 78-55-79cm
- **Hair:** Blond, Ahoge, Ponytail, Long, Wavy, Spiky Bangs, Sidehair
- **Body:** Teen, Slim, Pale, Tail, Four-Legged, Small Breasts
- **Engages in:** Fighting
- **Clothes:** Bracer, Gauntlet, Plate Armor, Detached Sleeves, Strapless Dress, Ribbon Hair Tie, Choker, Tassets, Breastplate
- **Items:** Lance, Shield
- **Role:** Betrothed, Knight, Centaur
- **Personality:** Naive, Serious, Watashi
- **Eyes:** Tsurime, Cyan
- **Voiced by:** Aozora Ramune

### R-Komadori (R-コマドリ)
- **Gender:** Female
- **Measurements:** Height: 140cm, Bust-Waist-Hips: 65-52-70cm
- **Hair:** White, Twin Tails, Waist Length+, Wavy, Spiky Bangs, Sidehair
- **Body:** Slim, Pale, Kid, Small Breasts
- **Eyes:** Green, Jitome
- **Clothes:** Thigh-high Stockings, Crown, Detached Sleeves, Cross Design, Hair Tie, Bindi (Jewelry), Sailor School Uniform, Loafers, Sleeveless Turtleneck Dress
- **Personality:** Pretending, Arrogant, Watashi
- **Role:** Betrothed, Robot
- **Engages in:** Lactation
- **Voiced by:** Nishino Miku

### Tegusu Gozen (てぐす 御前)
- **Gender:** Female
- **Measurements:** Height: 153cm, Bust-Waist-Hips: 74-55-77cm
- **Hair:** Black, Hime Cut, Waist Length+, Straight, Blunt Bangs, Sidehair
- **Body:** Slim, Unnatural Skin Tone, Multiple Legs, Small Breasts
- **Eyes:** Red, Tareme, Unnatural Sclera
- **Clothes:** Kimono, Turtleneck Sweater, Pleated Skirt, Haori, Sailor School Uniform
- **Items:** Katana
- **Personality:** Deredere, Stoic, Relaxed, Warawa
- **Role:** Betrothed, Princess, Arachne, Jorougumo
- **Subject of:** Fake Death
- **Engages in:** Elopement
- **Voiced by:** Himari

### 42 (よんじゅうに)
- **Gender:** Female
- **Measurements:** Weight: 1000kg
- **Personality:** Pretending
- **Role:** Princess, Robot
- **Engages in:** Cleaning, Mind Control
- **Body:** Non-Humanoid
- **Voiced by:** Kusano Karen

### Mikuriya Saki (御厨 左姫)
- **Gender:** Female
- **Measurements:** Height: 148cm, Bust-Waist-Hips: 74-53-77cm
- **Hair:** Violet, Bob Cut, Shoulder-length, Straight, V Bangs, Sidehair
- **Body:** Teen, Slim, Pale, Tiny, Insect Wings, Small Breasts
- **Engages in:** Cooking
- **Eyes:** Violet
- **Clothes:** Headband, Thigh-high Stockings, Hoodie, Hair Flower, Ankle Boots, Short Shorts
- **Role:** Twin Sister, Non-blood-related Sister, Fairy, Younger Sister
- **Personality:** Third Person
- **Voiced by:** Satou Chiyuki

### Mikuriya Yuuki (御厨 右姫)
- **Gender:** Female
- **Measurements:** Height: 148cm, Bust-Waist-Hips: 74-53-77cm
- **Hair:** Violet, Bob Cut, Shoulder-length, Straight, V Bangs, Sidehair
- **Body:** Teen, Slim, Pale, Giant, Small Breasts
- **Engages in:** Cooking
- **Eyes:** Violet, Tareme
- **Clothes:** Headband, Miniskirt, Thigh-high Stockings, Hairpin, Blouse, Mary Jane
- **Role:** Twin Sister, Non-blood-related Sister, Extraterrestrial, Younger Sister
- **Personality:** Third Person
- **Voiced by:** Harukawa Akari

### Nadius the 11th (ナーディウス11世)
- **Gender:** Female
- **Measurements:** Height: 168cm, Bust-Waist-Hips: 92-60-98cm
- **Hair:** Violet, Waist Length+, Wavy, Spiky Bangs, Sidehair
- **Body:** Slim, Pale, Adult, Fang, Makeup, Big Breasts
- **Eyes:** Amber, Tsurime, Slit Pupils
- **Role:** Mother, Emperor, Not a Virgin, Dragon
- **Personality:** Refined, Watashi
- **Engages in:** Shapeshifting
- **Clothes:** Turtleneck Dress
- **Voiced by:** Oboredani Rias

### Nishi Mayuko (西 真由子)
- **Gender:** Female
- **Measurements:** Height: 156cm, Bust-Waist-Hips: 82-56-81cm
- **Hair:** Brown, Short, Straight, Spiky Bangs
- **Eyes:** Brown, Tsurime
- **Body:** Teen, Slim, Pale, Furry Tail, Medium Breasts
- **Clothes:** T-shirt, Shorts, Knee-high Socks, Belt, Sailor School Uniform, Loafers
- **Personality:** Modern Tsundere, Yandere, Atashi
- **Subject of:** Mind Control, Insanity
- **Role:** Childhood Friend, Classmate, Eleventh Grader
- **Engages in:** Murder, Kidnapping
- **Voiced by:** Asaka Natsu

### Princess Sirius (シリウス王女)
- **Gender:** Both
- **Measurements:** Height: 140cm, Bust-Waist-Hips: 74-55-77cm
- **Hair:** Twin Tails, Long, Straight, Spiky Bangs, Orange
- **Body:** Slim, Pale, Fur, Futanari, Fang, Furry Tail, Small Breasts
- **Eyes:** Red, Tsurime
- **Clothes:** Dress, Hairpin, Prayer Beads
- **Role:** Princess
- **Personality:** Watashi
- **Voiced by:** Kusano Karen

## Shops
- [Official Website](http://www.cyc-soft.com/poison-pro/princess-x/x-top/top.html)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ007088.html)

## Releases
### Japanese
- **2011-09-02**: Princess X ~Boku no Iinazuke wa Monsterkko!?~ Trial Edition - [Official website](http://www.cyc-soft.com/poison-pro/princess-x/x-download/download_trial.html)
- **2011-09-22**: Princess X ~Boku no Iinazuke wa Monsterkko!?~ First Press Special Edition - [Official website](http://www.cyc-soft.com/poison-pro/princess-x/x-top/top.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=15550)
- **2011-12-22**: Princess X ~Boku no Iinazuke wa Monsterkko!?~ Download Edition - [Official website](http://www.cyc-soft.com/poison-pro/princess-x/x-top/top.html), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ006738.html), [Gyutto](https://gyutto.com/i/item70067), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0065285/), [DL.Getchu](http://dl.getchu.com/i/item1003718), [DMM](https://dlsoft.dmm.co.jp/detail/ggs_0666/)
- **2012-03-02**: Princess X Omatome Set - [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=16314)
- **2012-05-18**: Princess X Omatome Set - Download Edition - [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ007088.html), [Gyutto](https://gyutto.com/i/item83121), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0070476/), [DL.Getchu](http://dl.getchu.com/i/item1003958), [DMM](https://dlsoft.dmm.co.jp/detail/ggs_0726/)
- **2014-01-31**: Princess X ~Boku no Iinazuke wa Monsterkko!?~ Price Revised Edition - [Official website](http://www.cyc-soft.com/poison-pro/princess-x/x-top/top.html)
- **2014-11-28**: Princess X ~Boku no Iinazuke wa Monsterkko!?~ Windows 8.1 Support Edition - [Official website](http://www.cyc-soft.com/poison-pro/princess-x/x-top/top.html)
- **2016-02-26**: Princess X ~Boku no Iinazuke wa Monsterkko!?~ Windows 8.1 Support Edition - Download Edition - [Official website](http://www.cyc-soft.com/poison-pro/princess-x/x-top/top.html), [DMM](https://dlsoft.dmm.co.jp/detail/beye_0055/)

### English
- **2017-10-31**: Princess X - My Fiancee is a Monster Girl?! - Package Edition - [J-List](https://jlist.com/shop/product/PRINCESS-X---My-Fiancee-is-a-Monster-Girl-Regular-Edition)
- **2017-10-31**: Princess X - My Fiancee is a Monster Girl?! - Download Edition - [JAST USA](https://jastusa.com/games/jast014/princess-x:-my-fiancee-is-a-monster-girl!), [Fakku](https://www.fakku.net/games/princess-x-my-fiancee-is-a-monster-girl-english)

## Tags
Magic, ADV, Lesbian Sex, Incest, Comedy, Robot Heroine, Male Protagonist, Mother Support Character, Tentacle Rape, Bondage, Modern Day Japan, Protagonist's Sister as a Support Character, Evil Route, Protagonist with Glasses, Rapist Protagonist, Netorare, Student Protagonist, Urination Fetish, Sexual Devices, Defloration, Bad Endings with Story, Monster Girl Heroine, Avoidable Rape, Twin Blowjob, Intercrural Sex, Masturbation, Cunnilingus, Corruption of Characters, Protagonist's Fiancee as a Heroine, Enema, Ejaculation Choice, Outdoor Sex, Varying Ending Songs, Macrophilia, Monster Girl Support Character, Mindbreak, Bleep Censor, Anal Fingering, Changeable Font, Heroine with Big Breasts, Sex with Monster Girls, Microphilia, Centaur Heroine

## More Games from Poison@Berry
- [Princess X ~Boku no Iinazuke wa Monsterkko!?~](https://pinovel.net/v7689)
- [Princess X FD ~Iinazuke wa Owaranai!?~](https://pinovel.net/v9642)

---
*View the full details at [pinovel.net/v7689](https://pinovel.net/v7689).*

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