---
title: "Onii-chan Asobo"
description: "Koichi Akiyama, an ordinary 22-year-old game developer, has been living a boring life until one day his younger sister Ai paid him a visit.  Soon after Ai moves"
image: "https://t.vndb.org/cv/06/84506.jpg"
---

# Onii-chan Asobo

![Onii-chan Asobo](https://t.vndb.org/cv/06/84506.jpg)

**Aliases:** お兄ちゃん♡あそぼ, Let's play Onii-chan

**Developer:** il Shi

**Release date:** Sep 27, 2019

**Platform:** Windows

**Language:** English, Portuguese (Brazil)

**Rating:** 5.3/10 (112 votes)

## Description
Koichi Akiyama, an ordinary 22-year-old game developer, has been living a boring life until one day his younger sister Ai paid him a visit. 
Soon after Ai moves in with Koichi, she claims that she wants to become a game developer too, so her brother has to teach her everything he knows. 
The only problem is that Ai wants to create Hentai games, which puts Koichi in a dubious position. 
From now on these two need to learn how to work together and explore all the difficulties of writing Hentai stories.

[From [Steam](https://store.steampowered.com/app/954610/Oniichan_Asobo/)]

## Characters
### Koichi Akiyama
An ordinary game developer, has been living a boring life until one day his younger sister [url=/c77549]Ai[/url] paid him a visit.

- **Gender:** Male
- **Hair:** Black, Short, Eye Covering
- **Body:** Slim, Pale, Young-adult
- **Eyes:** Hidden
- **Personality:** Carefree
- **Role:** Full Brother, Cousin, Domestic Partner, Boyfriend, Writer, Older Brother, Video Game Developer
- **Subject of:** Filming, Seduction

### Ai Akiyama
[url=/c77543]Koichi[/url]'s Younger sister. She paid a visit to him.

Soon after she moves in with Him, she claims that she wants to become a game developer too, so her brother has to teach her everything he knows. 

The only problem is that she wants to create Hentai games, which puts him in a dubious position.

- **Gender:** Female
- **Hair:** Violet, Shoulder-length, Spiky Bangs, Twin Braids
- **Body:** Teen, Slim, Pale, Medium Breasts
- **Eyes:** Blue
- **Clothes:** Kimono, Kemonomimi Headband, Cardigan, Miniskirt, Thigh-high Stockings, Tank Top, Hairpin, Choker
- **Role:** Full Sister, Cousin, Domestic Partner, Girlfriend, Writer, Bisexual, Younger Sister
- **Engages in:** Filming, Seduction
- **Personality:** Brother Complex, Mischievous, Assertive

### Sayuri
Cousin to Koichi and Ai. She begins to live with them when her finances take a hit.

For reasons unknown, she is completely obedient to Ai.

- **Gender:** Female
- **Hair:** Brown, Waist Length+, Curtained, No Bangs, Sidehair
- **Body:** Slim, Pale, Young-adult, Medium Breasts
- **Role:** Cousin, Homosexual, Shop Clerk
- **Clothes:** Maid's Dress, Maid's Headdress
- **Eyes:** Garnet
- **Personality:** Flustered, Obedient

## Shops
- [Steam](https://store.steampowered.com/app/954610/)

## Releases
### English
- **2019-09-27**: Onii-chan Asobo - [Steam](https://store.steampowered.com/app/954610/), [SteamDB](https://steamdb.info/app/954610/info/)

### Portuguese (Brazil)
- **TBA**: Onii-chan Asobo - [Official website](https://erogesptbr.com/onii-chan-asobo/)

## Tags
ADV, Brother/Sister Romance, Maid Heroine, Male Protagonist, Adult Protagonist, Single Ending, Brief NVL Scenes, Cousin Incest, Protagonist's Cousin as a Heroine, Slice of Life, Heroine with Zettai Ryouiki, Lots of Event CGs, Design Story, Brocon Heroine, Protagonist's Younger Sister as a Heroine, Brother/Sister Incest, Under the Same Roof, Vaginal Masturbation, Lesbian Sex, Only Protagonist's Relatives as Heroine(s), Mutual Masturbation, Group Sex of One Male and Several Females, Voyeurism, Cunnilingus, Protagonist's Full Sister as a Heroine, Single Blowjob, Penile Masturbation, Facesitting, Blood-related Brother/Sister Incest, Defloration, Vaginal Fingering, Single Handjob

## More Games from il Shi
- [Onii-chan Asobo](https://pinovel.net/v24583)

---
*View the full details at [pinovel.net/v24583](https://pinovel.net/v24583).*

```json
{"@context":"https://schema.org","@type":"VideoGame","@id":"https://pinovel.net/v24583#game","name":"Onii-chan Asobo","description":"Koichi Akiyama, an ordinary 22-year-old game developer, has been living a boring life until one day his younger sister Ai paid him a visit.  Soon after Ai moves","url":"https://pinovel.net/v24583","image":"https://t.vndb.org/cv/06/84506.jpg","author":{"@type":"Organization","name":"il Shi"},"aggregateRating":{"@type":"AggregateRating","ratingValue":"5.3","bestRating":10,"worstRating":1,"ratingCount":112}}
```