---
title: "Ore no Ane ga Konna ni Hinnyuu no Wake ga Nai!?"
description: "The protagonist is an ordinary college student—except when it comes to his older sister. His sister, much older than him, is a beautiful and capable woman, admi"
image: "https://t.vndb.org/cv/62/5362.jpg"
---

# Ore no Ane ga Konna ni Hinnyuu no Wake ga Nai!?

![Ore no Ane ga Konna ni Hinnyuu no Wake ga Nai!?](https://t.vndb.org/cv/62/5362.jpg)

**Alternative Title:** 俺の姉がこんなに貧乳のわけがない！？

**Developer:** AHAAN

**Release date:** Feb 23, 2010

**Platform:** Windows

**Language:** Japanese

**Rating:** 6.8/10 (12 votes)

## Description
The protagonist is an ordinary college student—except when it comes to his older sister.
His sister, much older than him, is a beautiful and capable woman, admired as the “Madonna” of her school where she works as a teacher. But that’s just her public persona. At home, she’s a tyrant, treating her younger brother like a servant.

One day, the protagonist ends up taking care of his sister after she comes home drunk. That’s when he notices something spilling out of her chest—a mountain of padding. Turns out, his sister is secretly flat-chested. When she realizes he’s seen her secret, she punches him across the room.

After calming down, his sister confesses the truth she’s been hiding all this time: she’s been using padding to fake her figure, and no one’s ever noticed. Because of this, she’s never been able to undress in front of anyone or even date a man. She threatens to kill him if he tells anyone, but it’s clear her drunken state and frustration over her flat chest—and her virginity—have pushed her to open up.

“What can I do to make my chest bigger?” she asks.

Without thinking, the protagonist replies, “Maybe if you massage them?”
His sister admits she’s tried it herself, but it didn’t work. Then, without realizing the implications, he adds, “Maybe if a man does it?”

Big mistake.
His sister forces him to massage her chest. As he does, he starts feeling… strange. Meanwhile, his sister, experiencing this for the first time, begins to enjoy it. The tension builds, and she reaches her climax.

Afterward, she falls asleep, and the protagonist assumes she’ll forget everything by morning. But when she wakes up, she casually tells him, “You’re in charge of making them bigger from now on,” before heading off to school like nothing happened.

And so begins the dangerous relationship between brother and sister…

[Translated from [dlsite](https://www.dlsite.com/pro/work/=/product_id/VJ004649.html/)]

## Characters
### Asami (亜佐美)
The protagonist's older sister and the main heroine. She is an English teacher who is very popular in the academy she teaches, but is very complex about her very small breast size. She uses breast pads, and is afraid that because of her AA-cup breasts, she has not been able to lose her virginity.

- **Gender:** Female
- **Measurements:** AA cup
- **Hair:** Violet, Waist Length+, Curtained, Straight, Spiky Bangs, Sidehair
- **Body:** Slim, Pale, Young-adult, Small Breasts
- **Clothes:** Pantyhose, Tie Pin, Breast-Pads
- **Personality:** Tsundere, Low Self-esteem, Watashi
- **Role:** Full Sister, Teacher, Older Sister, Sexual Submissive
- **Subject of:** Pregnancy, Inferiority Complex, Teasing
- **Voiced by:** Moegi Yui

### Yuuna (優菜)
The protagonist's girlfriend who has very big breasts. When she met the protagonist, she was just a simple girl, but after becoming his girlfriend, she became a cute yet erotic girl.

- **Gender:** Female
- **Hair:** Brown, Long, Wavy, V Bangs, Parted to Side, Sidehair
- **Body:** Teen, Slim, Pale
- **Eyes:** Green
- **Clothes:** Dress, Blouse, Clothing with Ribbons, Ribbon Hair Accessory, Pleated Skirt
- **Personality:** Shy, Kind, Stubborn, Watashi
- **Role:** Girlfriend, Not a Virgin
- **Engages in:** Seduction
- **Voiced by:** Sumishiro Kiyoka

## Shops
- [Official Website](http://ahaan.net/products_01.html)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ004649.html)

## Releases
### Japanese
- **2010-02-23**: Ore no Ane ga Konna ni Hinnyuu no Wake ga Nai!? - [Official website](http://ahaan.net/products_01.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=13729), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ004649.html), [Gyutto](https://gyutto.com/i/item38013), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0041132/), [DL.Getchu](http://dl.getchu.com/i/item1002321), [DMM](https://dlsoft.dmm.co.jp/detail/cnct_0001/)

## Tags
ADV, Male Protagonist, Multiple Endings, Teacher Heroine, Nukige, High Sexual Content, Group Sex of One Male and Several Females, Pregnant Sex, Heroine with Sexual Experience, Tsundere Heroine, Defloration, Sex in Public Places, Wake-up Sex, Protagonist in Relationship, Sixty-nine, Twin Blowjob, Inbreeding, Cunnilingus, Female Ejaculation, Protagonist's Girlfriend as a Heroine, Outdoor Sex, Title Parody, Play Piercing, Cowgirl, Reverse Cowgirl, Sex in Water, Wax Play, Standing Sex, Suction on Nipples, Changeable Font, Nipple Piercing, Rope Bondage, Anal Sex, Sex with Protagonist Only, Heroine with Big Breasts, Heroine with Flat Chest (Non-Loli), Hidden Vibrator, Erotic Spanking, Bathroom Sex, Pissing, Blood-related Brother/Sister Incest, Pregnancy, Shy Heroine, Sitting Sex, Protagonist's Full Sister as a Heroine, Single Blowjob, Protagonist's Older Sister as a Heroine, Ahegao, Single Boobjob, Adult Heroine

## More Games from AHAAN
- [Ore no Ane ga Konna ni Hinnyuu no Wake ga Nai!?](https://pinovel.net/v4339)
- [Funin Chiryou](https://pinovel.net/v5294)
- [Oyako Donburi wa Ikka Danran no Mae ni H na Oyako wa Suki Desu ga?](https://pinovel.net/v11169)
- [Akogare no Onee-san o, Kon'yakusha kara Netoru Houhou](https://pinovel.net/v10010)
- [Kubiwa Gakkyuu Boku wa Osananajimi-sama no Shimobe Desu](https://pinovel.net/v8090)

---
*View the full details at [pinovel.net/v4339](https://pinovel.net/v4339).*

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```