---
title: "Naisho Shishunki ~Himitsu ni Koi Suru Imouto-tachi~"
description: "My first kiss was with my younger sister.... I thought about our relationship after we kissed.... However, she told me with tears of joy in her eyes, \"Well, it'"
image: "https://t.vndb.org/cv/28/1428.jpg"
---

# Naisho Shishunki ~Himitsu ni Koi Suru Imouto-tachi~

![Naisho Shishunki ~Himitsu ni Koi Suru Imouto-tachi~](https://t.vndb.org/cv/28/1428.jpg)

**Alternative Title:** ないしょ思春期 ～ヒミツに恋する妹たち～

**Aliases:** 女子校生淫愛思春期　ヒミツな放課後

**Developer:** HAMHAM-SOFT

**Release date:** Nov 28, 2008

**Platform:** Windows

**Language:** Japanese

**Rating:** 6.3/10 (11 votes)

## Description
My first kiss was with my younger sister.... I thought about our relationship after we kissed.... However, she told me with tears of joy in her eyes, "Well, it's our secret, right?" Like this, our new relationship begins.... "There'll be no problem if we just keep them secret!" 

[Edited from [Himeya Shop](http://www.himeyashop.com/product_info.php/products_id/11477)]

## Characters
### Sakurada Seiji (桜田 征司)
- **Gender:** Male
- **Aliases:** Familia, ファミリア
- **Hair:** Brown, Short
- **Body:** Teen, Pale
- **Clothes:** School Uniform, Shirt, Jeans
- **Role:** Non-blood-related Brother, High School Student, Older Brother
- **Personality:** Closet Pervert

### Miura Maki (三浦 真紀)
- **Gender:** Female
- **Measurements:** Height: 163cm, Bust-Waist-Hips: 92-61-88cm
- **Hair:** Blond, Ponytail, Short, Parted in Middle
- **Body:** Teen, Pale
- **Clothes:** School Uniform, Necktie, Shirt, Cardigan, Wristband, Miniskirt, Sport Bloomers, Knee-high Socks, Thigh-high Stockings, Sports Uniform, Flower, Ribbon Hair Tie, Skirt Suit
- **Personality:** Pervert, Energetic
- **Role:** Kouhai, High School Student
- **Engages in:** Tennis
- **Eyes:** Garnet
- **Voiced by:** Sakura Reona

### Mizuki Kyou (水城 杏)
- **Gender:** Female
- **Measurements:** Height: 159cm, Bust-Waist-Hips: 87-61-86cm
- **Hair:** Long, Green, V Bangs, Sidehair
- **Body:** Teen, Pale
- **Clothes:** School Uniform, Mini-dress, Cardigan, Skirt, Sport Bloomers, Pantyhose, Collar, Naked Apron, Blouse, Veil, New Type School Swimsuit
- **Eyes:** Violet
- **Personality:** Reserved, Low Self-esteem
- **Role:** Kouhai, High School Student, Library Committee Member
- **Items:** Book, Umbrella
- **Engages in:** Childbirth
- **Voiced by:** Ogura Yui

### Nagami Yuuko (永見 悠子)
- **Gender:** Female
- **Measurements:** Height: 146cm, Bust-Waist-Hips: 73-55-78cm
- **Hair:** Blue, Twin Tails, Waist Length+, Parted to Side, Hair Loopies
- **Body:** Pale, Kid, Small Breast Sizes
- **Clothes:** School Uniform, Mini-dress, Sport Bloomers, Pendant Necklace, Hair Tie, Ribbon Hair Tie, Skirt Suit, Sundress
- **Personality:** Friendly, Immature
- **Role:** Teacher
- **Eyes:** Garnet
- **Voiced by:** Asari

### Sakurada Miyuu (桜田 美柚)
- **Gender:** Female
- **Aliases:** Miyumiyu, ミユミユ, Myuuchan, みゅーちゃん
- **Measurements:** Height: 154cm, Bust-Waist-Hips: 81-58-83cm
- **Hair:** Short, Orange
- **Body:** Teen, Pale
- **Clothes:** School Uniform, Pajamas, Shirt, Wristband, Evening Gloves, Shorts, Sport Bloomers, Knee-high Socks, Thigh-high Stockings, Belt, Wedding Dress, Sports Uniform, Veil, Skirt Suit, Old Type School Swimsuit, Tiara
- **Eyes:** Blue
- **Role:** Non-blood-related Sister, Kouhai, High School Student, Younger Sister
- **Items:** Bag
- **Engages in:** Tennis, Lactation, Wedding
- **Personality:** Brother Complex, Puffy, Third Person
- **Voiced by:** Shindou Mayumi

### Kotegawa (古手川)
- **Gender:** Female
- **Aliases:** Onikote, オニコテ
- **Hair:** Brown, Waist Length+, Parted in Middle
- **Eyes:** Brown, Hosome
- **Body:** Pale, Adult
- **Clothes:** Glasses, Cross Necklace, Habit
- **Personality:** Strict
- **Role:** Principal
- **Voiced by:** Sakura Reona

### Suzuhara Rokusaburou (鈴原 六三郎)
- **Gender:** Male
- **Hair:** Blue, Ahoge, Short, Spiky Bangs, Parted in Middle
- **Body:** Teen, Pale
- **Clothes:** School Uniform, Shirt, Jeans, Sunglasses, Pendant Necklace, Sports Uniform
- **Eyes:** Blue
- **Personality:** Airhead, Womanizer
- **Role:** Classmate, High School Student
- **Voiced by:** Kakogawa Takashi

### Hamuko (ハム子)
she is Hamham Soft's mascot character.

- **Gender:** Female
- **Hair:** Brown, Twin Tails, Short, Parted in Middle
- **Eyes:** Brown
- **Body:** Teen, Pale, Wings
- **Clothes:** T-shirt, Court Shoes, Hair Tie, Leggings

## Shops
- [Official Website](https://hamham-soft.net/product/himitu/)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ005639.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=553445)

## Releases
### Japanese
- **2008-11-28**: Naisho Shishunki ~Himitsu ni Koi Suru Imouto-tachi~ - [Official website](https://hamham-soft.net/product/himitu/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=11169), [Getchu](http://www.getchu.com/soft.phtml?id=553445)
- **2011-04-08**: Naisho Shishunki ~Himitsu ni Koi Suru Imouto-tachi~ Download Edition - [Official website](https://hamham-soft.net/product/himitu/), [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ005639.html), [Gyutto](https://gyutto.com/i/item56294), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0051478/)

## Tags
High School, Male Protagonist, School Life Comedy, High Sexual Content, Defloration, Cunnilingus, Brocon Heroine, Doggy Style, Female Ejaculation, Cowgirl, Reverse Cowgirl, Standing Sex, Tribadism on Penis, Perverted Heroine, High School Student Heroine, Only Virgin Heroines, Heroine with Big Breasts, Teacher Heroine, Bukkake, Discreet Sex, Heroine with Sport Bloomers, Protagonist's Younger Sister as a Heroine, Boobs on Glass, Protagonist's Non-blood-related Sister as a Heroine, Energetic Heroine, Outdoor Sex, Sex at School, Protagonist's Kouhai as a Heroine, Single Boobjob, Sex in Public Places, High School Student Protagonist, Quickie Fix Position, Adult Breast Sucking, Perverted Protagonist, Ponytail Heroine, Non-blood-related Brother/Sister Incest, Naked Heroine with Apron, Single Handjob, Heroine with Small Breasts (Non-Loli), Heroine with Swimsuits, Anal Sex, Single Blowjob, Group Sex of One Male and Several Females, Twin Blowjob, Vaginal Masturbation, Vaginal Fingering, Spoons, Mirror Sex, Sitting Sex, Sex on Toilet, Butterfly, Hidden Vibrator, Bathroom Sex

## More Games from HAMHAM-SOFT
- [Imouto ni! Sukumizu Kisetara Nugasanai!](https://pinovel.net/v1419)
- [Degarashi](https://pinovel.net/v36916)
- [Naisho Shishunki ~Himitsu ni Koi Suru Imouto-tachi~](https://pinovel.net/v1158)
- [Doinaka Channel 5 ~Kochira Suzune Gakuen Housou-bu~](https://pinovel.net/v3243)
- [Flag Heshiori Otoko](https://pinovel.net/v5257)
- [LO-Angle!!](https://pinovel.net/v11725)
- [Low Rise!!!](https://pinovel.net/v15909)
- [Low Spec!? ~Ore to Toshishita Kanojo to Seikyouiku!~](https://pinovel.net/v18875)
- [Imouto o Kegashita Kioku](https://pinovel.net/v22156)
- [Yuki no Yoru, Ore wa Imouto o Hadaka ni Suru.](https://pinovel.net/v25593)
- [Imosapo! ~Genkin de Low na Kyonyuu Imouto ni, Oppai Momasete Moraimashita~](https://pinovel.net/v28539)
- [Low na Imouto ni Succubus ga Toritsuita node Tanetsuke Yoyuu deshita.](https://pinovel.net/v30895)
- [Imobabu! ~Low na Imouto no Iyashi Oppai ga Sugoi no de, Boku no Jinsei Sasagemasu~](https://pinovel.net/v34616)
- [Mikotonori! ~Imouto Miko to Nakadashi Jorei~](https://pinovel.net/v44902)
- [Imouto wa Namaiki Kasshoku Maid-san.](https://pinovel.net/v49271)
- [Imouto Miki-chan no Nama Haishin Channel!](https://pinovel.net/v54618)
- [Sokubaku Jouzu na Koakuma Musume ♪](https://pinovel.net/v59022)
- [High Angle ~Osananajimi no Volley-bu Ace ga, Ore ni dake Amaetekuru~](https://pinovel.net/v67336)

---
*View the full details at [pinovel.net/v1158](https://pinovel.net/v1158).*

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