---
title: "Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~"
description: "The protagonist is currently living together with his older sister and going to prep school everyday. He likes her but is unable to be honest about his feelings"
image: "https://t.vndb.org/cv/98/139798.jpg"
---

# Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~

![Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~](https://t.vndb.org/cv/98/139798.jpg)

**Alternative Title:** いけない子作り４ ～生意気な姉貴が実は俺のザーメンが大好きだった！？～

**Developer:** Eroit

**Release date:** Apr 28, 2017

**Platform:** Windows, DVD

**Language:** Japanese, English

**Rating:** 6.8/10 (73 votes)

## Description
The protagonist is currently living together with his older sister and going to prep school everyday. He likes her but is unable to be honest about his feelings.

One day, he comes home early and see his sister masturbating while sniffing his shorts. At the height of his arousal, he unintentionally has sex with her.

After doing the deed and being questioned if she likes him, his sister denies it on the ground that she only likes his scent.

While disappointed at her words, he is delighted to know that from now on, he can make her do anything using his smell.

[Translated from [Official Site](http://www.boot.eroit.net/ikenaikodukuri4/story.html)]

## Characters
### Suzuya Ren (鈴谷 廉)
- **Gender:** Male
- **Role:** Father, Son, Full Brother, Roommate, Younger Brother, Kanendosei

### Suzuya Kasumi (鈴谷 霞)
She yells and gets extremely angry whenever her brother forces her into sex but it feels so good and her body wants his baby so badly she always gives in.

- **Gender:** Female
- **Measurements:** Height: 165cm, Bust-Waist-Hips: 96-56-87cm, H cup
- **Hair:** Blue, Ahoge, Waist Length+, Straight, Spiky Bangs, Sidehair
- **Body:** Slim, Pale, Young-adult, Big Breasts
- **Eyes:** Black, Tsurime
- **Clothes:** Apron, Catsuit, Miniskirt, Thigh-high Stockings, Cuffs, Blouse, Choker, Waitstaff Uniform, Sling Bikini
- **Role:** Mother, Daughter, Full Sister, Roommate, Waitstaff, University Student, Older Sister
- **Personality:** Classic Tsundere, Mature, Watashi
- **Subject of:** Pregnancy
- **Engages in:** Lactation, Childbirth
- **Voiced by:** Asaka Natsu

## Shops
- [Official Website](http://www.boot.eroit.net/ikenaikodukuri4/index.html)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ011064.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=1352849)

## Releases
### Japanese
- **2017-04-21**: Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~ Trial Edition - [Official website](http://www.boot.eroit.net/ikenaikodukuri4/index.html#trial)
- **2017-04-28**: Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~ Package Edition - [Official website](http://www.boot.eroit.net/ikenaikodukuri4/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=24994), [Getchu](http://www.getchu.com/soft.phtml?id=947956)
- **2017-04-28**: Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~ Download Edition - [Official website](http://www.boot.eroit.net/ikenaikodukuri4/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=24994), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ011064.html), [Gyutto](https://gyutto.com/i/item185897), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0155188/), [DL.Getchu](http://dl.getchu.com/i/item1005817), [DMM](https://dlsoft.dmm.co.jp/detail/ggs_1088/)
- **2017-08-17**: Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~ DVDPG - [Official website](http://www.n43project.com/n43/mnpg84/index.html), [Getchu](http://www.getchu.com/soft.phtml?id=964118), [DMM](https://www.dmm.co.jp/mono/anime/-/detail/=/cid=h_107mnpg84/)
- **2018-02-23**: Eroitto Kozukuri Series Pack - [Official website](http://www.boot.eroit.net/eropack.html)
- **2020-11-19**: Ikenai Kozukuri 3 + 4 - Low Price Edition DVDPG - [Official website](http://n43project.com/n43/npg376/index.html), [Getchu](http://www.getchu.com/soft.phtml?id=1110247), [DMM](https://www.dmm.co.jp/mono/anime/-/detail/=/cid=h_107npg376/)
- **2026-01-22**: Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~ Low Price Edition DVDPG - [Official website](http://www.n43project.com/n43/mnpg262/index.html), [Getchu](http://www.getchu.com/soft.phtml?id=1352849)

### English
- **2022**: Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~ - [Official website](https://sugoivisualnovel.up.railway.app/vns/20908)

## Tags
ADV, Blood-related Brother/Sister Incest, Brother/Sister Romance, Male Protagonist, Multiple Endings, Classic Tsundere Heroine, Nukige, Only a Single Heroine, Pregnant Sex, Under the Same Roof, Defloration, Only Virgin Heroines, Missionary Position, Impregnation, Lactation During Sex, Inbreeding, Rounin Protagonist, Brocon Heroine, Doggy Style, Armpit Sex, Outdoor Sex, Naked Sprites, Cowgirl, Only Protagonist's Sisters as Heroine(s), Standing Sex, Sitting Sex, Spoons, Piledriver, Kissing Scene, Armpit Licking, Only Older Heroines, Adult Breast Sucking, Sex on a Beach, Single Boobjob, Single Blowjob, Vaginal Masturbation, Vaginal Fingering, Only Blood-related Heroines, Protagonist's Older Sister as a Heroine, Protagonist's Full Sister as a Heroine, Visible Cervix Penetration

## More Games from Eroit
- [Nee-san no Kareshi ~Akogare no Nee-san ga Shin'yuu to Tsukiai Hajimemashita~](https://pinovel.net/v12819)
- [Ikenai Kozukuri ~Shin'yuu no Okaa-san ni Tanetsuke Shimakuru Isshuukan~](https://pinovel.net/v14547)
- [Oyako Ai ~Ikenai Kozukuri 2~](https://pinovel.net/v15287)
- [Kaa-san no Otoko ~Yajuu no You na Otoko ni Mesu no Yorokobi o Oboesaserareru Saiai no Haha~](https://pinovel.net/v16720)
- [Oyako Ai 2](https://pinovel.net/v17429)
- [Ikenai Kozukuri 3 ~Musuko no Koibito ga Miryokuteki de Komattemasu~](https://pinovel.net/v18812)
- [Boku no Daisuki na Oba-san](https://pinovel.net/v19189)
- [Onna Ninja Azusa vs Orc ~Zecchou! Ishukan Battle!~](https://pinovel.net/v20365)
- [Ikenai Kozukuri 4 ~Namaiki na Aneki ga Jitsu wa Ore no Semen ga Daisuki Datta!?~](https://pinovel.net/v20908)
- [Bokan ~Kaa-san no Naka wa Dare no Mono?~](https://pinovel.net/v22066)
- [Ikenai Kozukuri 5 ~Tonari ni Koshitekita Hitozuma to Ikenai Sex~](https://pinovel.net/v22470)
- [Onna Ninja Azusa vs Orc 2 ~Injuu-tachi no Utage~](https://pinovel.net/v23059)
- [Musume no Mirai ~Itoshii Musume ga Kairaku ni Ochiru Toki~](https://pinovel.net/v24856)
- [Onna Ninja Azusa vs Orc 3 ~Injuu-tachi no Oukoku~](https://pinovel.net/v25554)
- [Tomodachi no Haha ~Jukujuku Taru Omoi~](https://pinovel.net/v28015)
- [Kaa-san no Otoko 2 ~Saiai no Haha ni Muragaru Osu~](https://pinovel.net/v28402)
- [Aisai ~Tsuma to Oyaji Dake no Toki~](https://pinovel.net/v30974)
- [Hitozuma Heaven ~Takuran Ureta Shikyuu ni Kodane o Sosogu~](https://pinovel.net/v31770)
- [Boku no Inai Jikan ni Maotoko-tachi ni Tanetsukesareru Haha](https://pinovel.net/v38518)
- [Hitozuma Heaven 2 ~Hanshoku Mansion, Hitozuma no Shikyuu o Kodane de Mitasu~](https://pinovel.net/v50141)
- [Torarenbo ~Natsu no Aru Hi, Kaa-san wa Boku no Shin'yuu no Kodomo o Migomotta~](https://pinovel.net/v52445)
- [Ikenai Kozukuri DX ~Kousai Aite no Hahaoya to Ikenai Kozukuri~](https://pinovel.net/v58249)
- [Tomodachi no Haha 2 ~Ren'ai Jouju no Kami Appli de Shin'yuu no Kaasan o Koibito ni~](https://pinovel.net/v64165)

---
*View the full details at [pinovel.net/v20908](https://pinovel.net/v20908).*

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