---
title: "Mezameru to Itoko o Mamoru Bishoujo Kenshi ni Natteita"
description: "One day Ryou wakes up as a girl, which comes as a shock for him.  Apparently his family's main branch has long protected the secrets of oni mastering. Some of o"
image: "https://t.vndb.org/cv/42/52942.jpg"
---

# Mezameru to Itoko o Mamoru Bishoujo Kenshi ni Natteita

![Mezameru to Itoko o Mamoru Bishoujo Kenshi ni Natteita](https://t.vndb.org/cv/42/52942.jpg)

**Alternative Title:** 目覚めると従姉妹を護る美少女剣士になっていた

**Aliases:** I Became a Beautiful Swordswoman to Protect My Cousin

**Developer:** Mille Feuille

**Release date:** Jan 25, 2013

**Platform:** Windows

**Language:** English, Japanese

**Rating:** 6.4/10 (63 votes)

## Description
One day Ryou wakes up as a girl, which comes as a shock for him.

Apparently his family's main branch has long protected the secrets of oni mastering. Some of oni are displeased with this slavery and continuously target a member of the family with the highest Renki power, called the Oni-Pleasing Princess. The current Princess is Yume, Ryou's cousin and his secret crush.

Oni-Pleasing Princess receives a protector swordswoman, called the Oni-Cutting Princess. The protectors have always been female, and as Yume unconsciously wanted Ryou to protect her, he has awakened as Oni-Cutting Princess, at the same time transforming into a girl.

Now, oni are gathering to make an attack on Yume, and Ryou must use his newfound powers to hold them back.

## Characters
### Ichijou Haruka (一条 はるか)
Ryou's female form, he transforms into, after his cousin Yume comes under a danger of falling prey to oni.

- **Gender:** Female
- **Alias:** Oni-Cutting Princess
- **Hair:** Blue, Ponytail, Waist Length+
- **Clothes:** School Uniform, T-shirt, Shorts, Gym Shorts, Sport Bloomers, Thigh-high Stockings, Tail, Ribbon Tie, Hair Tie, Fingerless Gloves, Torn Clothing, Old Type School Swimsuit, Sling Bikini, Pet Collar, Nekomimi Headband
- **Engages in:** Swordsmanship
- **Eyes:** Violet, Tsurime
- **Items:** Katana
- **Role:** Cousin, High School Student
- **Subject of:** Tentacle Restraint, Sex Change (Male to Female)
- **Voiced by:** Kurata Mariya

### Ichijou Ryou (一条 遼)
A normal guy who one day turns into a swordswoman, whose task is to protect his cousin Yume from oni.

- **Gender:** Male
- **Hair:** Blue, Short
- **Clothes:** School Uniform, Necktie, T-shirt, Jeans
- **Eyes:** Violet
- **Role:** High School Student
- **Subject of:** Sex Change (Male to Female)
- **Voiced by:** Kurata Mariya

### Ichijou Yume (一条 結女)
Ryou's cousin and the current incarnation of Oni-Pleasing Princess. After she comes into danger, Ryou becomes her female protector.

- **Gender:** Female
- **Alias:** Oni-Pleasing Princess
- **Hair:** Brown, Twin Tails, Shoulder-length
- **Eyes:** Brown
- **Clothes:** School Uniform, T-shirt, Sport Bloomers, Thigh-high Stockings, Ribbon Tie, Old Type School Swimsuit
- **Role:** Cousin, High School Student
- **Subject of:** Sexual Harassment
- **Voiced by:** Misonoo Mei

### Rasetsu Douji (羅刹 童子)
A kijin, who commands other oni to go after Yume.

[spoiler]She's been defeated a long time ago and sealed away. She's been reincarnated as Sakatani Kimino, who initially had no idea about this.[/spoiler]

- **Gender:** Both
- **Alias:** Lawless Ruler, Rasetsu
- **Hair:** White, Short
- **Eyes:** Violet, Tsurime
- **Clothes:** Necklace, Thigh-high Stockings, Fingerless Gloves
- **Body:** Futanari, Horns, Androgynous
- **Role:** Bisexual, Oni
- **Subject of:** Sealing
- **Voiced by:** Aoi Tokio

### Sakatani Kimino (坂谷 希美乃)
Ryou's and Yume's childhood friend.

- **Gender:** Female
- **Hair:** Red, Short
- **Clothes:** School Uniform, T-shirt, Sport Bloomers, Thigh-high Stockings, One Piece Swimsuit, Ribbon Tie
- **Eyes:** Blue
- **Role:** High School Student
- **Subject of:** Sexual Harassment, Malevolent Possession
- **Voiced by:** Aoi Tokio

### Watanabe Tsunayoshi (渡辺 綱吉)
A friend of Ryou, who engages in various martial arts. He gets a crush on Ryou's female alter ego, Haruka.

- **Gender:** Male
- **Hair:** Black, Short
- **Clothes:** School Uniform
- **Eyes:** Black
- **Role:** Classmate, High School Student

### Kitaminami Hideko (北南 秀子)
A student council president.

- **Gender:** Female
- **Hair:** Waist Length+, Grey, Parted in Middle
- **Eyes:** Amber
- **Role:** Student Council President
- **Engages in:** Not Sexually Involved
- **Items:** Microphone
- **Clothes:** Old Type School Swimsuit
- **Voiced by:** Yuzuhara Miu

## Shops
- [Official Website](http://www.mille-feuille.jp/mf/mezameruto/index.html)
- [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ109837.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=759112)

## Releases
### Japanese
- **2013-01-25**: Mezameru to Itoko o Mamoru Bishoujo Kenshi ni Natteita - Package Edition - [Official website](http://www.mille-feuille.jp/mf/mezameruto/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=17972), [Getchu](http://www.getchu.com/soft.phtml?id=759112)
- **2013-01-27**: Mezameru to Itoko o Mamoru Bishoujo Kenshi ni Natteita - Download Edition - [Official website](http://www.mille-feuille.jp/mf/mezameruto/index.html), [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ109837.html), [Gyutto](https://gyutto.com/i/item99003), [Gyutto](https://gyutto.com/i/item98995), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0077424/), [DL.Getchu](http://dl.getchu.com/i/item20791), [DMM](https://dlsoft.dmm.co.jp/detail/milu_0013/)

### English
- **2021-06-06**: When I Woke Up, I'd Become a Pretty Swordswoman Who Protects My Cousin - [Official website](https://tfgames.site/?module=viewgame&id=2541)

## Tags
ADV, Sword Combat, Male Protagonist, Female Protagonist, Fighting Protagonist, Tentacle Rape, Nukige, Sexual Slavery, Group Sex of One Female and Several Males, Sex Change, Cousin Incest, Protagonist's Cousin as a Heroine, Demons, Gender Bending, High Amounts of Rape, Lesbian Rape, Bad Ending(s), Vibrators, Defloration, Sex in Public Places, Bad Endings with Story, Ejaculation Forewarner, High Amount of Bad Endings, Literary Adaptation, Genderbent Sex, Gang Rape, Naked Sprites, Mindbreak, Monster Rape, Only One Good Ending, Piss Drinking, Futanari on Female, Major Antagonist, Pissing, High School Student Heroine, Completely Unavoidable Protagonist Rape

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---
*View the full details at [pinovel.net/v11736](https://pinovel.net/v11736).*

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