---
title: "Boku no Daiji na Ane wa Aitsu no Omocha"
description: "I have a precious sister. Ever since my mother died when I was young, she has always been a substitute for my mother. She has always been by my side, in place o"
image: "https://t.vndb.org/cv/40/126940.jpg"
---

# Boku no Daiji na Ane wa Aitsu no Omocha

![Boku no Daiji na Ane wa Aitsu no Omocha](https://t.vndb.org/cv/40/126940.jpg)

**Alternative Title:** 僕の大事な姉はあいつのオモチャ

**Developer:** Jinsei Tsuukoudome

**Release date:** Jul 21, 2010

**Platform:** Windows

**Language:** Japanese

**Rating:** 5.5/10 (12 votes)

## Description
I have a precious sister. Ever since my mother died when I was young, she has always been a substitute for my mother. She has always been by my side, in place of my father, who is often away on business trips. She is always by my side, even in hard times - when I feel lonely, when I feel sad. Even when I feel happy.  She is an irreplaceable and precious person. That's why I thought she would always be by my side. Until I heard those words from Mayu's mouth.

"You see, big sister has a boyfriend now♪"

From that day on, the relationship between me and Mayu changed.

Mayu, who was a virgin, was given sexual pleasure by a man, and her innocent body was gradually developed. And all I could do was watch Mayu change. I decided to accept this reality, even though it was hard to do so, because I wanted her to be happy.

But there was a strange rumor about that man.
“It's just for fun, of course she's a bitch.”
"But I feel sorry for Taku-chan, having such a slut as a family member."
"To you, she's just a precious little girl, but to us, she's just a cum toilet."


An ADV where you can only watch as your beloved sister is deceived and played with by a man who only cares for sex.

[From [Official Developer Website](http://rinrin.saiin.net/~j-tuukoudome/myweb1_123.htm) Translated Via Google Translate]

## Characters
### Tsukishiro Mayu (月代 まゆ)
- **Gender:** Female
- **Hair:** Pink, Ahoge, Shoulder-length, Thick Eyebrows
- **Body:** Slim, Big Breasts
- **Eyes:** Red, Tareme
- **Clothes:** Dress, Hat, Wristband, Hairpin, Bow Tie, Choker, Over The Knee Socks
- **Personality:** Shy, Kind
- **Role:** Older Sister
- **Voiced by:** Momoka Ren

## Shops
- [Official Website](https://j-tukoudome.lovesick.jp/15thtop.html)
- [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ01407839.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=1346043)

## Releases
### Japanese
- **2010-07-21**: Boku no Daiji na Ane wa Aitsu no Omocha - [Official website](http://rinrin.saiin.net/~j-tuukoudome/myweb1_118.htm), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=14078), [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ064160.html), [Gyutto](https://gyutto.com/i/item41888), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0043159/), [DMM](https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_043209/)
- **2020-07-21**: Jinsei Tsuukoudome 10 Shuunen Kinen Box - Download Edition - [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ291917.html), [DMM](https://www.dmm.co.jp/dc/doujin/-/detail/=/cid=d_228071/)
- **2020-10-23**: Jinsei Tsuukoudome 10 Shuunen Kinen Box - Package Edition - [Melonbooks.co.jp](https://www.melonbooks.co.jp/detail/detail.php?product_id=715711), [Getchu](http://www.getchu.com/soft.phtml?id=1102728), [Toranoana](https://ec.toranoana.shop/tora/ec/item/040030852530/)
- **2025-07-18**: Jinsei Tsuukoudome 15 Shuunen Kinen Box - Download Edition - [Official website](https://j-tukoudome.lovesick.jp/15thtop.html), [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ01407839.html)
- **2025-12-26**: Jinsei Tsuukoudome 15 Shuunen Kinen Box - Package Edition - [Official website](https://j-tukoudome.lovesick.jp/15thtop.html), [Getchu](http://www.getchu.com/soft.phtml?id=1346043)

## Tags
Male Protagonist, Only a Single Heroine, Group Sex of One Female and Several Males, Kinetic Novel, Vibrators, Sounds of Copulation, Heroine with Ahoge, Intercrural Sex, Bukkake, Voyeurism, Doggy Style, Gang Rape, Rape by Deception, Netorare Type A, Defloration by Others, Cowgirl, Only Protagonist's Sisters as Heroine(s), Butterfly, Rape Involving Drugs, Quickie Fix Position, Double Penetration (Group Sex), Anal Rape, Heroine Having Sex with Others, Single Boobjob, Single Blowjob, Anal Sex, High School Student Heroine, Heroine with Big Breasts

## More Games from Jinsei Tsuukoudome
- [Boku no Daiji na Ane wa Aitsu no Omocha](https://pinovel.net/v17268)
- [Gura Shota](https://pinovel.net/v26432)
- [Kimi no Tonari](https://pinovel.net/v13472)
- [Kimi no Omoi](https://pinovel.net/v12078)
- [Hidamari no Kioku](https://pinovel.net/v14401)
- [Honto no Kimochi](https://pinovel.net/v16881)
- [Iro Yoridori](https://pinovel.net/v19319)
- [KanoBitch ~Kanojo ga Bitch ni Natta Riyuu~](https://pinovel.net/v22008)
- [Egao no Riyuu](https://pinovel.net/v19320)
- [Koromogawari](https://pinovel.net/v24695)
- [Kanojo no Kankei](https://pinovel.net/v54137)
- [Kotoneiro](https://pinovel.net/v22625)
- [Onna Tomodachi](https://pinovel.net/v68332)

---
*View the full details at [pinovel.net/v17268](https://pinovel.net/v17268).*

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```