---
title: "Onee-chan Cube"
description: "College student Arisaka Miku lives alone with his cousin two years his senior, Shunzaki Nanatsu. The pair spend their school days as any would until one day, a "
image: "https://t.vndb.org/cv/61/106261.jpg"
---

# Onee-chan Cube

![Onee-chan Cube](https://t.vndb.org/cv/61/106261.jpg)

**Alternative Title:** お姉ちゃんの3乗（きゅーぶ）

**Aliases:** おねきゅー, siscube, Onee-chan no 3 Jou (Kyuubu)

**Developer:** Marron

**Release date:** Jul 25, 2003

**Platform:** Windows

**Language:** Japanese, Chinese (simplified)

**Rating:** 6.6/10 (5 votes)

## Description
College student Arisaka Miku lives alone with his cousin two years his senior, Shunzaki Nanatsu. The pair spend their school days as any would until one day, a mysterious distortion in the space-time continuum splits Nanami into three girls. Their names, looks, and personalities are all different but they are certainly still "Miku's older sister". Then a fairy from another world comes to investigate the distortion...

So begins this strange tale of cohabitation with three times the *onee-sans* and three times the pampering!

[Based on synopsis from the [official website](https://web.archive.org/web/20110224160534/http://www.marron.nu:80/web/product/sis_cube/index.html) and back of game box]

## Characters
### Arisaka Miku (有坂 未空)
- **Gender:** Male
- **Hair:** White, Short
- **Eyes:** Hidden
- **Role:** Cousin

### Devil Demonil Dewarill (デビル＝デモニラ＝デワーリル)
An elite investigator from a different world correcting and investigating the distortion of space-time. Her aliases are Devil-child, Demoline, Debit, and various others depending on the mood of the protagonist. Her clothes and her wings are rather satanic. She seems kinda like an Imp, but contrarily to her appearance, she's a gentle fairy.

- **Gender:** Female
- **Aliases:** 妖精のデビルさん, Yousei no Devil-san, Fairy Devil
- **Hair:** Antenna, Shoulder-length, Green, Spiky, Spiky Bangs
- **Body:** Teen, Slim, Pale, Pointed Ears, Tiny, Bat Wings, Demon Tail
- **Clothes:** Earrings, Miniskirt, Thigh-high Stockings, Collar, Bracelet, Pleated Skirt, Slit Skirt
- **Personality:** Kind
- **Role:** Fairy
- **Eyes:** Garnet

### Shunzaki Iria (春崎 いりあ)
One of the three people [url=/c69821]Nanatsu[/url] gets split into.

- **Gender:** Female
- **Aliases:** りあねえ, Rianee
- **Measurements:** Height: 170cm, Weight: 49kg, Bust-Waist-Hips: 94-60-90cm
- **Hair:** Blue, Antenna, Waist Length+
- **Eyes:** Violet, Tareme
- **Clothes:** Glasses

### Shunzaki Kogamo (春崎 小鴨)
One of the three people [url=/c69821]Nanatsu[/url] gets split into.

- **Gender:** Female
- **Measurements:** Height: 138cm, Weight: 34kg, Bust-Waist-Hips: 68-47-66cm
- **Hair:** Violet, Ponytail, Waist Length+, Spiky Bangs
- **Body:** Slim, Pale, Kid
- **Eyes:** Violet
- **Clothes:** Skirt, Pleated Skirt
- **Role:** Cousin

### Shunzaki Nanatsu (春崎 七夏)
The protagonist's cousin who lives with him.
She gets caught up in some kind of mysterious space-time distortion and gets split into three people.

- **Gender:** Female
- **Measurements:** Height: 167cm, Weight: 47kg, Bust-Waist-Hips: 75-58-84cm
- **Hair:** Pink, Ahoge, Waist Length+, Ringlet
- **Eyes:** Brown
- **Role:** Cousin

### Shunzaki Rikka (春崎 立夏)
One of the three people [url=/c69821]Nanatsu[/url] gets split into.

- **Gender:** Female
- **Aliases:** なつねえ, Natsunee
- **Measurements:** Height: 162cm, Weight: 46kg, Bust-Waist-Hips: 87-59-82cm
- **Hair:** Blond, Ahoge, Shoulder-length
- **Eyes:** Blue
- **Role:** Cousin, Tsukkomi
- **Clothes:** Choker

### ???
A mysterious lady with a wealthy air.
She seems to have some connection with the protagonist.

- **Gender:** Female
- **Hair:** Brown, Ponytail, Waist Length+, Blunt Bangs, Sidehair
- **Eyes:** Brown, Tareme
- **Body:** Slim, Pale, Young-adult, Big Breasts
- **Clothes:** Gloves, Ribbon Hair Tie, Puffy Sleeves, Ball Gown
- **Role:** No Name, Ojousama
- **Personality:** Mysterious

### Kamakura Yumeko (鎌倉 夢子)
- **Gender:** Female
- **Hair:** Short, Green, Blunt Bangs
- **Body:** Teen, Slim, Pale
- **Eyes:** Green
- **Clothes:** Beret

## Shops
- [Official Website](https://web.archive.org/web/20110224160534/http://www.marron.nu:80/web/product/sis_cube/index.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=16463)

## Releases
### Japanese
- **2003-07-25**: Onee-chan Cube - First Press Limited Edition - [Official website](https://web.archive.org/web/20110224160534/http://www.marron.nu:80/web/product/sis_cube/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=2902), [Getchu](http://www.getchu.com/soft.phtml?id=16463)

### Chinese (simplified)
- **2025-07-23**: Onee-chan no Cube - [Official website](https://github.com/moyu15645/patch/blob/main/%E3%81%8A%E5%A7%89%E3%81%A1%E3%82%83%E3%82%93%E3%81%AE%EF%BC%93%E4%B9%97%EF%BC%88%E3%81%8D%E3%82%85%E3%83%BC%E3%81%B6%EF%BC%89.zip)

## Tags
Sexual Content, ADV, Romance, Comedy, Male Protagonist, Nameable Protagonist, Low Sexual Content, White Haired Protagonist

## More Games from Marron
- [Cosmos no Sora ni](https://pinovel.net/v1132)
- [Onee-chan Cube](https://pinovel.net/v7399)
- [Himawari no Chapel de Kimi to](https://pinovel.net/v425)
- [Himawari no Chapel de Kimi to Gaiden Onnakyoushi - Nidoki Ichisaka (Kyuusei)](https://pinovel.net/v33222)

---
*View the full details at [pinovel.net/v7399](https://pinovel.net/v7399).*

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