---
title: "Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~"
description: "The protagonist, Nagasawa Ikki, has a little sister named Nagasawa Mao. She's in a bit of a difficult phase of puberty. Mao is reliable, cheerful, openhearted, "
image: "https://t.vndb.org/cv/45/92445.jpg"
---

# Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~

![Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~](https://t.vndb.org/cv/45/92445.jpg)

**Alternative Title:** 俺の妹は、ツンデレで変態でした ～お兄ちゃんの前でだけなんだからね！

**Developer:** Appetite

**Release date:** Sep 30, 2011

**Platform:** Windows, DVD

**Language:** Japanese

**Rating:** 5.9/10 (30 votes)

## Description
The protagonist, Nagasawa Ikki, has a little sister named Nagasawa Mao. She's in a bit of a difficult phase of puberty. Mao is reliable, cheerful, openhearted, excels at her studies, and is a perfect superwoman! Ikki always gets treated strictly by his little sister, and even if he is her older brother, he's completely outclassed by Mao. 

One day, as usual, Ikki is nearly late for school, and was struck by Mao to wake him up. While complaining, he went with his little sister and rode a crowded train together to avoid being late. The train was jam packed, which resulted to them sticking together and unable to move. At that time, whether its a coincidence or a prank from God, the train shook which caused Mao's breast to push into her brother. Even if she is his little sister, Mao is a beauty who is around his age, and as such, he started acting strange and was getting aroused. Mao noticed Ikki's change in behavior and said "Could it be that you got aroused?". Ikki was unable to answer, and with a devilish smile, Mao said "I'm your little sister, you know?". And then she reached her hand towards her brother's "swelled thing"......

[Translated from [Official Site](http://www.appetite-game.com/apt_003.html#scene)]

## Characters
### Nagasawa Kazuki (永沢 一輝)
- **Gender:** Male
- **Hair:** Black
- **Eyes:** Hidden
- **Role:** Older Brother

### Nagasawa Mao (永沢 真央)
Nagasawa Ikki's little sister. Excels at her studies, cheerful, openhearted, and is popular at school. Always treats her big brother Ikki strictly, but she's very much aware that it's just the flip side of her love for Ikki. During that one time at the train, Mao actively went on the offensive against her brother. She's a pervert with an exhibitionist fetish. When around others and even her parents, she can't be upfront with her feelings, but when alone with her brother, she becomes gentle and sweet. 

When in her "tsun" mode, she calls Ikki "Nii-san", and when in her "dere" mode, she calls him "Onii-chan".

[Translated from [url=http://www.appetite-game.com/apt_003.html#char]Official Site[/url]]

- **Gender:** Female
- **Measurements:** Height: 150cm, Bust-Waist-Hips: 80-54-81cm, C cup
- **Hair:** Black, Bob Cut, Short
- **Body:** Teen, Slim, Pale
- **Clothes:** School Uniform, Glasses, T-shirt, Miniskirt, No Panties, Traditional Bloomers, Crop Top
- **Engages in:** Cooking, Planning, Molesting, Lactation, Wedding
- **Eyes:** Violet
- **Personality:** Modern Tsundere, Pervert, Strict, Stubborn, Smart, Brother Complex, Third Person, Watashi
- **Subject of:** Split Personality, Pregnancy
- **Role:** Betrothed, Full Sister, Domestic Partner, Exhibitionist, Younger Sister, Older Sister, School Athletic Club Member
- **Voiced by:** Nagi

## Shops
- [Official Website](http://www.appetite-game.com/aptp_010.html)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ011282.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=967959)

## Releases
### Japanese
- **2011-09-08**: Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~ Trial Edition - [Official website](http://www.appetite-game.com/apt_003.html#download)
- **2011-09-30**: Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~ Package Edition - [Official website](http://www.appetite-game.com/apt_003.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=15985)
- **2011-09-30**: Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~ Download Edition - [Official website](http://www.appetite-game.com/apt_003.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=15985), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ006178.html), [Gyutto](https://gyutto.com/i/item67980), [Gyutto](https://gyutto.com/i/item67008), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0057861/), [DL.Getchu](http://dl.getchu.com/i/item14215), [DMM](https://dlsoft.dmm.co.jp/detail/aman_0021/), [DMM](https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_041128/)
- **2013-04-26**: Ore no Imouto wa, Tsundere de Hentai Deshita ~Onii-chan no Mae de Dake nan Dakara ne!~ DVDPG - [Official website](https://web.archive.org/web/20180101033359/http://www.world-pg.com/2013_products/index.html), [Getchu](http://www.getchu.com/soft.phtml?id=768822)
- **2017-09-29**: Appetite Select Pack - À La Carte VOL. 1 - Package Edition - [Official website](http://www.appetite-game.com/aptp_010.html), [Getchu](http://www.getchu.com/soft.phtml?id=967959)
- **2017-09-29**: Appetite Select Pack - À La Carte Vol. 1 - Download Edition - [Official website](http://www.appetite-game.com/aptp_010.html), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ011282.html)

## Tags
ADV, Blood-related Brother/Sister Incest, Male Protagonist, Multiple Endings, Heroine with Glasses, Modern Tsundere Heroine, Nukige, High Sexual Content, Group Sex of One Female and Several Males, Student Heroine, Pregnant Sex, Under the Same Roof, Completely Avoidable Netorare, Sex in Public Places, Anal Penetration, Footjob, Exhibitionism, Handjob, Lactation During Sex, Inbreeding, Intercrural Sex, Multiple Penetration, Bukkake, Buttjob, High School Student Protagonist, Brocon Heroine, Outdoor Sex, Cowgirl, Sitting Sex, Spoons, Glasses Option, Only One Bad Ending, Perverted Heroine, Heroine Having Sex with Others, Single Buttjob, Sixty-nine, Cunnilingus, Doggy Style, Protagonist's Full Sister as a Heroine, Single Blowjob, Only Younger Heroines, Anal Sex, Only Protagonist's Sisters as Heroine(s), Protagonist's Younger Sister as a Heroine, Pregnancy, Single Footjob, Food Play, Discreet Sex, Sex in Water, Sex in Front of an Audience, Defloration, Only Virgin Heroines, Female Ejaculation, Only Blood-related Heroines, Molestation on Public Transport, Single Handjob, Sex in a Vehicle, Only a Single Heroine, Standing Sex, Consensual Phone Sex, Bathroom Sex, Missionary Position, Heroine with Multiple Personalities, Mutual Masturbation, Adult Breast Sucking, Quickie Fix Position, Double Penetration (Group Sex), Voyeurism, Single Boobjob, Heroine with Small Breasts (Non-Loli)

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---
*View the full details at [pinovel.net/v7871](https://pinovel.net/v7871).*

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