---
title: "Imouto ga Neteiru Aida ni...."
description: "Genya has a younger sister, Yumemi. One day, he can't stop his sexual desire and secretly gropes her while she is asleep. He feels sorry to her and starts livin"
image: "https://t.vndb.org/cv/86/29086.jpg"
---

# Imouto ga Neteiru Aida ni....

![Imouto ga Neteiru Aida ni....](https://t.vndb.org/cv/86/29086.jpg)

**Alternative Title:** 妹が寝ている間に……

**Aliases:** Sleep Sister

**Developer:** Heat-Soft

**Release date:** Aug 29, 2008

**Platform:** Windows, DVD

**Language:** Japanese

**Rating:** 5.6/10 (8 votes)

## Description
Genya has a younger sister, Yumemi. One day, he can't stop his sexual desire and secretly gropes her while she is asleep. He feels sorry to her and starts living alone. However, Yumemi comes to his apartment and sleeps together. He gropes her every night and his demeanors get bolder and bolder.... And he finally has sex with her....

[From ErogeShop]

## Characters
### Nemurino Gen'ya (眠野 幻夜)
- **Gender:** Male
- **Hair:** Black, Short
- **Body:** Teen, Pale
- **Clothes:** Trousers, T-shirt, Collar
- **Role:** Non-blood-related Brother, Older Brother

### Nemurino Yumemi (眠野 夢美)
- **Gender:** Female
- **Hair:** Brown, Twin Tails, Curtained, Short, Spiky Bangs, Parted to Side
- **Body:** Slim, Pale, Kid, Small Breast Sizes
- **Eyes:** Violet, Tareme
- **Clothes:** Mini-dress, Pajamas, Shirt, Miniskirt, Bikini, One Piece Swimsuit, Ribbon Hair Tie, Pareo, Shimapan, Crop Top, Decorative Belt, Over The Knee Socks
- **Role:** Non-blood-related Sister, Younger Sister
- **Engages in:** Cosplay
- **Personality:** Mischievous
- **Voiced by:** Shimada Kaori

## Shops
- [Official Website](http://www.heat-soft.com/imouto/)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ002902.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=676028)

## Releases
### Japanese
- **2008-08-29**: Imouto ga Neteiru Aida ni.... - Package Edition - [Official website](http://www.heat-soft.com/imouto/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=11238), [Getchu](http://www.getchu.com/soft.phtml?id=558925)
- **2008-08-29**: Imouto ga Neteiru Aida ni.... - Download Edition - [Official website](http://www.heat-soft.com/imouto/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=11238), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ002902.html), [Gyutto](https://gyutto.com/i/item11783), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0023747/), [DL.Getchu](http://dl.getchu.com/i/item1001189), [DMM](https://dlsoft.dmm.co.jp/detail/kaku_0021/)
- **2010-03-25**: Heat-Soft Yoru no Himegoto Pack - DVDPG - [Official website](https://web.archive.org/web/20130324020316/http://www.dennoclub.com/TitleList/dcpg/DCPG213/dcpg213.htm), [Getchu](http://www.getchu.com/soft.phtml?id=676028), [DMM](https://www.dmm.co.jp/mono/anime/-/detail/=/cid=h_294dcpg213/)

## Tags
Sexual Content, ADV, Non-blood-related Brother/Sister Incest, Romance, Brother/Sister Romance, Comedy, Male Protagonist, Modern Day, Nukige, Protagonist's Non-blood-related Sister as a Heroine, Only a Single Heroine, Branching Plot, Defloration, Only Virgin Heroines, Intercrural Sex, Pegging, Only Loli Heroines, Sex with Sleepers, Only Protagonist's Sisters as Heroine(s), Naizuri, Only Younger Heroines, Protagonist's Younger Sister as a Heroine, Loli Heroine, Straight Lolicon, Lolicon Protagonist

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- [Imouto ga Neteiru Aida ni....](https://pinovel.net/v1536)
- [Nurse Shimai no Yoru no Gangu wa Boku!](https://pinovel.net/v6386)
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---
*View the full details at [pinovel.net/v1536](https://pinovel.net/v1536).*

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