---
title: "Ore no Nee-chan to Tenkousei ga Erokunatta Wake"
description: "True love and school life simulation with an immoral dilemma. Freely enjoy the time between Golden Week holiday and Summer Vacation.  Daily life was peaceful bu"
image: "https://t.vndb.org/cv/51/21551.jpg"
---

# Ore no Nee-chan to Tenkousei ga Erokunatta Wake

![Ore no Nee-chan to Tenkousei ga Erokunatta Wake](https://t.vndb.org/cv/51/21551.jpg)

**Alternative Title:** 俺のねーちゃんと転校生がエロくなった理由

**Aliases:** Why I Had Sex With My Older Sister

**Developer:** Studio-74

**Release date:** Dec 13, 2011

**Platform:** Windows

**Language:** Japanese

**Rating:** 6.5/10 (8 votes)

## Description
True love and school life simulation with an immoral dilemma.
Freely enjoy the time between Golden Week holiday and Summer Vacation.

Daily life was peaceful but busy:
You were deeply involved in school, and were dating a transfer student.
Then you had that sweet, dangerous night with your sister.

The secret thrill led to another incident. And another.
Each day the perversion escalated a bit more.

Two heroines, two lives and developments.
Forbidden incest and a dream school life.
Which will you choose?

[From [DLsite English](http://www.dlsite.com/ecchi-eng/work/=/product_id/RE087112.html)]

## Characters
### Ashikaya Serina (芦茅 芹菜)
- **Gender:** Female
- **Role:** Transfer Student
- **Voiced by:** Ooyama Chiroru

### Yamashina Aya (山科 亜矢)
- **Gender:** Female
- **Role:** Full Sister, Older Sister
- **Body:** Big Breasts
- **Voiced by:** Suzuki Ryou

## Shops
- [Official Website](http://www.studio-74.net/works/works-028-ne-chan.html)
- [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ087112.html)

## Releases
### Japanese
- **2011-12-13**: Ore no Nee-chan to Tenkousei ga Erokunatta Wake - Download Edition - [Official website](http://www.studio-74.net/works/works-028-ne-chan.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=16404), [DLsite](https://www.dlsite.com/maniax/work/=/product_id/RJ087112.html), [Gyutto](https://gyutto.com/i/item73623)
- **2011-12-16**: Ore no Nee-chan to Tenkousei ga Erokunatta Wake - Package Edition - [Official website](http://www.studio-74.net/works/works-028-ne-chan.html)

## Tags
Sexual Content, ADV, Simulation Game, Tsundere Heroine, Heroine with Big Breasts

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---
*View the full details at [pinovel.net/v9671](https://pinovel.net/v9671).*

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