---
title: "Otouto Shibori ~Ane-tachi no Sei Kyouiku~"
description: "The story is about a boy named Kouta who attends St. Narihari Academy, a school for students from kindergarten to university with his beloved older sister, Suzu"
image: "https://t.vndb.org/cv/26/143126.jpg"
---

# Otouto Shibori ~Ane-tachi no Sei Kyouiku~

![Otouto Shibori ~Ane-tachi no Sei Kyouiku~](https://t.vndb.org/cv/26/143126.jpg)

**Alternative Title:** おとうとしぼり ～姉たちの性教育～

**Developer:** Momoiro Gekijou

**Release date:** Feb 1, 2013

**Platform:** Windows

**Language:** Japanese, English

**Rating:** 6.1/10 (27 votes)

## Description
The story is about a boy named Kouta who attends St. Narihari Academy, a school for students from kindergarten to university with his beloved older sister, Suzuka. However, Suzuka has been secretly harboring sexual desires for her brother, and after confirming his interest, she takes his virginity. When Suzuka's classmate, Himari, finds out about their relationship, she blackmails Suzuka into letting her have sex with Kouta too.

## Characters
### Shimoyama Kouta (下山 康太)
A young boy who adores his older sister; unaware that she harbors sexual designs on him,
he dutifully obeys her—even when she scolds or teases him.
Although he remained devoted to her even after she took his virginity and turned him into a sex slave, he plunged into the depths of despair after being handed over to her friend to be used as a toy—all while witnessing the look of ecstasy on his sister's face as she watched.

Typically wears a school uniform and shorts. Small-sized penis with phimosis (forced to expose the glans by his sister).

- **Gender:** Male
- **Hair:** Black, Short, Parted to Side
- **Body:** Slim, Pale, Kid, Small Penis
- **Eyes:** Amber
- **Role:** Full Brother, Younger Brother
- **Clothes:** Hoodie, Short Shorts
- **Personality:** Opposite Gender Voiced
- **Voiced by:** Hanafusa Mirai

### Sekino Himari (赤野 ひまり)
Suzuka’s classmate and best friend.
She has a college-student boyfriend and is sexually experienced, but she has grown bored with the run-of-the-mill sex she has with him.
After forcing Suzuka to confess that she had hooked up with her younger brother, she insists, "Let me do it with your brother too!" and forcibly joins in on the action.
Seeing Kota moaning with teary, watery eyes gives her a thrill, leading her to realize she has a thing for younger boys.

In contrast to Suzuka, she has short hair and an energetic personality. She has a slender build but possesses a large bust.

- **Gender:** Female
- **Hair:** Red, Shoulder-length, Short
- **Body:** Teen, Slim, Pale, Big Breasts
- **Clothes:** School Uniform, Necktie, Pleated Skirt
- **Eyes:** Violet
- **Role:** University Student
- **Voiced by:** Shiina Amane

### Shimoyama Suzuka (下山 涼々夏)
Kota’s older sister and a second-year student at Seinabari Gakuen, a school offering a continuous education program from kindergarten through high school.
She harbors a twisted kind of love for her younger brother; she teases and torments him precisely because she adores him too much.
"I won't let any pests get close to *my* Haru!" she declares, having kept a constant watch over him since their kindergarten days to ensure no girls ever got close to him.
Then, upon realizing Kota had reached the age of puberty (specifically, experiencing his first ejaculation), she finally resolves to make him her own.
With eyes only for her brother, she remains a virgin and has never dated anyone else.
She has the appearance of a gentle, laid-back older sister; even when she doled out harsh punishments, Kota would simply think, "It's my fault..." and never once realized the twisted nature of her desires...

Long hair, large breasts, and a gentle, laid-back look (with slightly drooping eyes). Slightly chubby.

- **Gender:** Female
- **Hair:** Violet, Waist Length+, Sidehair
- **Body:** Teen, Slim, Pale, Big Breasts
- **Clothes:** School Uniform, Necktie, Thigh-high Stockings, Pleated Skirt
- **Eyes:** Amber
- **Role:** Full Sister, University Student, Older Sister
- **Personality:** Brother Complex
- **Voiced by:** Ayase Yuri

### Yazu Haruki (夜須 陽輝)
A soccer-loving boy who is a classmate and close friend of Kota.
He prefers hanging out with the guys—like Kota—over interacting with the opposite sex,
and generally finds girls annoying.
Unlike the quiet Kota, he has a rambunctious personality; however, he harbors a complex about his unusually large penis, revealing a shy side that prevents him from even bathing with friends.

He typically wears his school uniform with shorts. He has a mischievous vibe, often sporting a Band-Aid on his knee.
He has a large, uncircumcised penis with phimosis.

- **Gender:** Male
- **Hair:** Brown, Short
- **Body:** Slim, Pale, Kid, Large Penis
- **Eyes:** Green
- **Role:** Classmate
- **Clothes:** Tank Top, Short Shorts
- **Personality:** Opposite Gender Voiced
- **Voiced by:** Suzuki Ryou

## Shops
- [Official Website](http://masterup.net/momoiro/product/otoutoshibori/index.html)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ007584.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=764080)

## Releases
### Japanese
- **2013-02-01**: Otouto Shibori ~Ane-tachi no Sei Kyouiku~ Download Edition - [Official website](http://masterup.net/momoiro/product/otoutoshibori/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=18198), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ007584.html), [Gyutto](https://gyutto.com/i/item98867), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0079725/), [DMM](https://dlsoft.dmm.co.jp/detail/ggs_0801/)
- **2013-03-08**: Otouto Shibori ~Ane-tachi no Sei Kyouiku~ Package Edition - [Official website](http://masterup.net/momoiro/product/otoutoshibori/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=18198), [Getchu](http://www.getchu.com/soft.phtml?id=764080)

### English
- **2026-06-23**: Little Brother Squeezing ~My Big Sisters' Sex Education~

## Tags
ADV, Blood-related Brother/Sister Incest, Oneesan-type Heroine, Protagonist with Voice Acting, Nukige, Group Sex of One Male and Several Females, Group Sex of One Female and Several Males, Shota Protagonist, Female Domination, Protagonist with a Face, Pegging, Brocon Heroine, Straight Shotacon, Heroine with Big Breasts, Cowgirl, Single Footjob, Protagonist's Full Sister as a Heroine, Single Blowjob, Gang Bang, Group Sex of Multiple Females and Males, Only Older Heroines, Reverse Cowgirl, Facesitting, Missionary Position, Male Protagonist, University Student Heroine, Cunnilingus, Sex Involving Children, Protagonist's Older Sister as a Heroine, Perverted Heroine, Double Penetration (Group Sex)

## More Games from Momoiro Gekijou
- [Shiishii Hinnyuu Shimai](https://pinovel.net/v2109)
- [Josou de Haramasete](https://pinovel.net/v3850)
- [Yume Miru Egoist](https://pinovel.net/v4045)
- [Tenki Ane](https://pinovel.net/v4543)
- [Motto! Josou de Haramasete](https://pinovel.net/v5796)
- [Zutto! Josou de Haramasete](https://pinovel.net/v8076)
- [Kyonyuu x Saimin -Kore ga Honto no JK! Kyonyuu Shimai to Pururun Saimin Seikatsu-](https://pinovel.net/v11231)
- [Otouto Shibori ~Ane-tachi no Sei Kyouiku~](https://pinovel.net/v12134)
- [Josou de Haramasete Gaiden ~Kako wa Yuuyami Iro no Shoujo to Tomo ni~](https://pinovel.net/v12556)
- [Kyonyuu x Roshutsu -K-cup Mogitate Kajitsu to L-Cup Ureta Kajitsu no Osoto de Pururun Aji Kurabe!-](https://pinovel.net/v12896)
- [Love Ecchi Dessan ~H na Miryoku o Egaku Tame ni! Omakase Pose Model~](https://pinovel.net/v14491)

---
*View the full details at [pinovel.net/v12134](https://pinovel.net/v12134).*

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