---
title: "Okaa-san to Na-i-sho ~Bijin Oyako, Bessou Kankin Nanokakan~"
description: "Yosuke, Yukari, his stepmother, and Natsuki, his stepsister, visit their summer house. Yosuke secretly loves Yukari and he plans to tell her that he loves her. "
image: "https://t.vndb.org/cv/94/6494.jpg"
---

# Okaa-san to Na-i-sho ~Bijin Oyako, Bessou Kankin Nanokakan~

![Okaa-san to Na-i-sho ~Bijin Oyako, Bessou Kankin Nanokakan~](https://t.vndb.org/cv/94/6494.jpg)

**Alternative Title:** おかあさんとな・い・しょ～美人母娘、別荘監禁7日間～

**Aliases:** Okaa-san to Naisho

**Developer:** Haou

**Release date:** Oct 14, 2005

**Platform:** Windows, DVD

**Language:** Japanese

**Rating:** 6.8/10 (26 votes)

## Description
Yosuke, Yukari, his stepmother, and Natsuki, his stepsister, visit their summer house. Yosuke secretly loves Yukari and he plans to tell her that he loves her. However, a group of bank robbers suddenly comes into their house. "Well, you're now our slaves. Just entertain us...." Like this, they are confined in a separate room.... Will Yosuke be able to save Yukari and Natsuki...? Also, will Yosuke tell Yukari that he loves her...?


[From [ErogeShop](http://web.archive.org/web/20081029224129/http://www.erogeshop.com:80/product_info.php/products_id/1011684)]

## Characters
### Mizuno Kouta (水野 耕太)
- **Gender:** Male
- **Hair:** Blue, Short
- **Subject of:** Assault, Confinement, Coercion
- **Engages in:** Molesting
- **Role:** Non-blood-related Brother, Non-blood-related Son
- **Personality:** Closet Pervert

### Mizuno Natsuki (水野 なつき)
- **Gender:** Female
- **Measurements:** Height: 157cm, Bust-Waist-Hips: 85-58-83cm, E cup
- **Hair:** Brown, Short, Pubic Hair
- **Eyes:** Green
- **Body:** Olive
- **Clothes:** Shorts, Tank Top, Hairpin, Strap-on Dildo, Baby-doll, Crop Top, New Type School Swimsuit, Crotchless Bodystocking
- **Subject of:** Molesting, Confinement, Coercion
- **Role:** Daughter, Step Sister
- **Personality:** Kind, Tomboy, Atashi, Cheerful
- **Engages in:** Cat Cosplay
- **Voiced by:** Shin (seiyuu)

### Mizuno Yukari (水野 由香璃)
- **Gender:** Female
- **Measurements:** Height: 160cm, Bust-Waist-Hips: 93-59-89cm, F cup
- **Hair:** Violet, Ponytail, Long, Pubic Hair
- **Body:** Pale, Big Breasts
- **Clothes:** Dress, Strap-on Dildo, Naked Apron, Ribbon Hair Tie, Mofuku, Tabi, Chemise
- **Subject of:** Molesting, Confinement, Coercion
- **Role:** Widow, Mother, Not a Virgin, Non-blood-related Mother
- **Eyes:** Teal
- **Engages in:** Cat Cosplay, Bunnygirl Cosplay
- **Voiced by:** Tama Hiyoko

### Yamagami Kyouko (山神 京子)
- **Gender:** Female
- **Measurements:** Height: 163cm, Bust-Waist-Hips: 90-57-87cm
- **Hair:** Brown, Waist Length+, Pubic Hair
- **Eyes:** Brown
- **Body:** Tattoo, Big Breast Sizes, Nail Polish
- **Clothes:** Miniskirt, One Piece Swimsuit, Garter Belt Stockings, Strap-on Dildo, Bra, Cupless Corset, Leather Jacket
- **Role:** Thief, Gang Leader, Not a Virgin, Dominatrix
- **Engages in:** Murder, Confinement
- **Personality:** Cruel
- **Voiced by:** Tsukiyama Kanaru

### Mizuno Shuuichi (水野 俊一)
- **Gender:** Male
- **Hair:** Brown, Short
- **Eyes:** Brown
- **Clothes:** Trousers, Glasses, Watch, Polo Shirt
- **Role:** Uncle

### Tobari (戸張)
- **Gender:** Male
- **Hair:** Short, Grey
- **Body:** Muscular, Ugly, Tall
- **Clothes:** T-shirt, Vest
- **Role:** Thief
- **Engages in:** Murder, Confinement
- **Eyes:** Sanpaku Eyes
- **Voiced by:** Yarita Sou

## Shops
- [Official Website](http://www.r18game.com/haoh/naisho/top.html)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ002691.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=597165)

## Releases
### Japanese
- **2005-10-14**: Okaa-san to Na-i-sho ~Bijin Oyako, Bessou Kankin Nanokakan~ - [Official website](http://www.r18game.com/haoh/naisho/top.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=6208), [Getchu](http://www.getchu.com/soft.phtml?id=199841)
- **2006-09-29**: Okaa-san to Na-i-sho -Bijin Oyako, Bessou Kankin Nanokakan- DVDPG - [Official website](https://web.archive.org/web/20080125163840/http://www.aicherry.com/aicherry/AICDV-0109/AICDV-0109.html), [DMM](https://www.dmm.co.jp/mono/anime/-/detail/=/cid=1481aicdv0109/)
- **2008-03-21**: Okaa-san to Na-i-sho ~Bijin Oyako, Bessou Kankin Nanokakan~ Download Edition - [Official website](http://www.r18game.com/haoh/naisho/top.html), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ002691.html), [DMM](https://dlsoft.dmm.co.jp/detail/rsp_0029/)
- **2008-11-28**: Okaa-san to Na-i-sho ~Bijin Oyako, Bessou Kankin Nanokakan~ Low Price Edition - [Official website](http://www.r18game.com/haoh/naisho/top.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=6208), [Getchu](http://www.getchu.com/soft.phtml?id=597165)
- **2014-04-25**: Toraware Choukyou Twin Pack - [DMM](https://www.dmm.co.jp/mono/pcgame/-/detail/=/cid=1906apc10768/)
- **2014-04-25**: Toraware Choukyou 2 Pack - [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0098042/), [DMM](https://dlsoft.dmm.co.jp/detail/rsp_0059/)

## Tags
ADV, Lesbian Sex, Rape, Non-blood-related Brother/Sister Incest, Male Protagonist, Nukige, Bondage, Protagonist's Non-blood-related Sister as a Heroine, Confinement, Group Sex of One Male and Several Females, Harem Ending, Heroine with Sexual Experience, Adult Heroine, Netorare, Protagonist's Non-blood-related Mother as a Heroine, Non-blood-related Mother/Son Incest, Female Domination, Strap-on Dildos, Defloration, Game Over, Scat, Blood-related Mother/Daughter Incest, Lactation During Sex, BDSM, Erotic Spanking, Pegging, More Than Seven Endings, Enema, Kidnapping, Ejaculation Choice, Slavery, Feet Licking, Oyakodon Ending, Rape by Proxy, Shoejob, Body Food, Dominatrix Heroine, Unavoidable Netorare, In-law Incest, Oyakodon, Holiday Cottage

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- [Yoru ni Saku Hana](https://pinovel.net/v15450)
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- [Tsuukin Kairaku ~Chikan de Go!~](https://pinovel.net/v7438)
- [Touch My Heart](https://pinovel.net/v15443)
- [Ura Kazoku Yuugi ~Oyako Choukyou Hanashi~](https://pinovel.net/v7450)
- [Ai Gangu](https://pinovel.net/v2272)
- [Tsuukin Kairaku 2 ~Chikan de Go! Go!~](https://pinovel.net/v7439)
- [Shikkoku ni Nureru Seijaku ~Jisatsu Shigansha~](https://pinovel.net/v11190)
- [Hitozuma Sekkan Club](https://pinovel.net/v6038)
- [Kokuin](https://pinovel.net/v4262)
- [Himitsu Seikatsu ~Hitotsu Yane no Shita~](https://pinovel.net/v1245)
- [Okaa-san to Na-i-sho ~Bijin Oyako, Bessou Kankin Nanokakan~](https://pinovel.net/v5236)
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- [Boku no Miko wa Chiisana Koibito ~Chouai~](https://pinovel.net/v1244)
- [Tsuukin Kairaku 3 ~Chikan yo, Tomare~](https://pinovel.net/v4026)

---
*View the full details at [pinovel.net/v5236](https://pinovel.net/v5236).*

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