---
title: "Jain no Ikenie Gaiden - Siscon Aniki, Imouto ga Suki Sugite Shokushu ni Natte Shimau"
description: "Hirosaka Kouta lives together with her younger sister, Kaede, due to their parents' jobs. He is an honor student with excellent grades at school. However, he is"
image: "https://t.vndb.org/cv/75/42575.jpg"
---

# Jain no Ikenie Gaiden - Siscon Aniki, Imouto ga Suki Sugite Shokushu ni Natte Shimau

![Jain no Ikenie Gaiden - Siscon Aniki, Imouto ga Suki Sugite Shokushu ni Natte Shimau](https://t.vndb.org/cv/75/42575.jpg)

**Alternative Title:** 邪淫のいけにえ外伝 シスコン兄貴、妹が好きすぎて触手になってしまう

**Developer:** CrossOver / CHAOS-R

**Release date:** Jun 26, 2020

**Platform:** Windows, Android

**Language:** Japanese

**Rating:** 6.0/10 (12 votes)

## Description
Hirosaka Kouta lives together with her younger sister, Kaede, due to their parents' jobs. He is an honor student with excellent grades at school. However, he is a severe siscon and loves Kaede from the bottom of his heart.

One day, He accidentally drops his phone in a plant when coming home from school. 
When he tries to pick it up, he gets bited by an unknown being, presumably an insect. 
However, the wound soon disappears as if nothing had happened.

When he gets home, his arms suddenly become tentacles and he rapes his sister involuntarily! They also find out that his arms gets back to normal after he had sex with her. 
As a result, Kaede offers to 'help' him whenever his arms turn into tentacles.

What will happen to their life after this?

[Based on the [official website's description](http://www.chaos-r.com/chaos-05.php)]

## Characters
### Hirosaka Kouta (広坂 幸太)
- **Gender:** Male
- **Hair:** Brown, Short, Straight
- **Body:** Teen, Slim, Pale, Tentacle
- **Engages in:** Cooking, Suicide Attempt, Self-harm
- **Eyes:** Hidden
- **Clothes:** Shirt, T-shirt
- **Personality:** Ore, Kind, Serious, Sister Complex
- **Role:** Full Brother, Boyfriend, Student Council Member, Nameable, Older Brother, Honor Student, Eleventh Grader

### Hirosaka Kaede (広坂 楓)
[url=/c99134]Hirosaka Kouta[/url]'s younger sister. Calls her brother "Nii-san".

An athletic girl, and is a member of school track and field club. Occasionally, she would quarrel with Kouta as a joke, but really never have an actual fight with him. She is really proud of her reliable brother, and love him very much as a family member. 

When Kouta's arms transformed into tentacles and raped her, she doesn't blame him for it. On the contrary, she lends him a hand and offered to do anything to help him control the tentacles.

- **Gender:** Female
- **Hair:** Shoulder-length, Straight, Side Tail, V Bangs, Orange, Sidehair
- **Body:** Teen, Slim, Pale, Medium Breasts
- **Engages in:** Cooking, Athletics
- **Eyes:** Green, Tsurime
- **Clothes:** Pajamas, T-shirt, Miniskirt, Sport Bloomers, Sports Shoes, Knee-high Socks, Hairpin, Hair Tie, Spats, Traditional Bloomers, Ankle Socks, Old Type School Swimsuit, Sports Jersey, Sailor School Uniform, Loafers
- **Personality:** Modern Tsundere, Kind, Brother Complex, Watashi, Cheerful
- **Role:** Full Sister, Girlfriend, Younger Sister, School Athletic Club Member, Tenth Grader
- **Subject of:** Pregnancy
- **Voiced by:** Konoe Yuzuko

## Shops
- [Official Website](http://www.chaos-r.com/chaos-05.php)
- [DLsite](https://www.dlsite.com/appx/work/=/product_id/VJ01003265.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=1214618)

## Releases
### Japanese
- **2020-06-26**: Jain no Ikenie Gaiden - Siscon Aniki, Imouto ga Suki Sugite Shokushu ni Natte Shimau - Package Edition - [Official website](http://www.chaos-r.com/chaos-05.php), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=29503), [Getchu](http://www.getchu.com/soft.phtml?id=1091396), [DMM](https://www.dmm.co.jp/mono/pcgame/-/detail/=/cid=2175cha006/)
- **2020-06-26**: Jain no Ikenie Gaiden - Siscon Aniki, Imouto ga Suki Sugite Shokushu ni Natte Shimau - Download Edition - [Official website](http://www.chaos-r.com/chaos-05.php), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=29503), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ013454.html), [DMM](https://dlsoft.dmm.co.jp/detail/views_0887/)
- **2020-06-26**: Jain no Ikenie 1-2-Gaiden Pack - Package Edition - [Official website](http://www.chaos-r.com/chaos-05.php), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=29503), [Getchu](http://www.getchu.com/soft.phtml?id=1091397), [DMM](https://www.dmm.co.jp/mono/pcgame/-/detail/=/cid=2175apc13542/)
- **2020-06-26**: Jain no Ikenie 1-2-Gaiden Pack - Download Edition - [Official website](http://www.chaos-r.com/chaos-05.php), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=29503), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ013455.html), [DMM](https://dlsoft.dmm.co.jp/detail/views_0890pack/)
- **2023-04-28**: Nukicolle vol.35 - Jain no Ikenie 3 + Gaiden - [Getchu](http://www.getchu.com/soft.phtml?id=1214618)
- **2024-12-20**: Jain no Ikenie Gaiden - Siscon Aniki, Imouto ga Suki Sugite Shokushu ni Natte Shimau - Download Edition - [DLsite](https://www.dlsite.com/appx/work/=/product_id/VJ01003265.html)

## Tags
Male Protagonist, Tentacle Rape, Modern Tsundere Heroine, Only a Single Heroine, Pregnant Sex, Consensual Sex Involving Tentacles, Tsundere Heroine, Only Virgin Heroines, Bukkake, Brocon Heroine, Naked Sprites, Siscon Protagonist, Excessive Semen, Only Protagonist's Sisters as Heroine(s), Background Moans, Only Younger Heroines, High School Student Heroine, Sex with Protagonist Only, Tentacle Blowjob, Wet and Messy, Symbiote / Parasite, Only Blood-related Heroines, Defloration, Heroine with Sport Bloomers, Blood-related Brother/Sister Incest, Protagonist's Younger Sister as a Heroine, Student Council Member Protagonist, Outdoor Sex, Protagonist's Full Sister as a Heroine, High School Student Protagonist, School Sports Club Member Heroine, Athlete Heroine, Inbreeding, Protagonist with Tentacles

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---
*View the full details at [pinovel.net/v28678](https://pinovel.net/v28678).*

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