---
title: "Cosmamania"
description: "Shuya Yamazaki, the protagonist, is a high school student. His mother died when he was a kid so his father, a famous archeologist and adventurer, remarried the "
image: "https://t.vndb.org/cv/78/142278.jpg"
---

# Cosmamania

![Cosmamania](https://t.vndb.org/cv/78/142278.jpg)

**Alternative Title:** こすままにあ

**Developer:** Discovery Mars

**Release date:** Oct 31, 2003

**Platform:** Windows, DVD

**Language:** Japanese

**Rating:** 7.4/10 (19 votes)

## Description
Shuya Yamazaki, the protagonist, is a high school student. His mother died when he was a kid so his father, a famous archeologist and adventurer, remarried the beautiful maid of the family, Midori.

Shuya has a girlfriend, Wakaba, but they've never had sex. One day, he is coming back to home after school when he sees his father and his stepmother having sex in the living room! Shocked, he runs to his bedroom.

The next day is Wakaba's birthday. As a gift she wants to finally have sex with Shuya. But because he was still shocked for what he saw the day before, he couldn't do it, making her mad.

Depressed, Shuya tries to talk with his father, but he's off on another of his adventures. Without choice, he asks Midori advice.

"Maybe you don't have confidence and experience enough with women..." - she says.

And so, Midori decides to train her stepson in the arts of sex an teach him how to satisfy a woman...

[Translated from [Getchu.com](http://www.getchu.com/soft.phtml?id=32366)]

## Characters
### Yamasaki Shuuya (山咲 秋也)
He is the only son of a famous archaeologist, Mankai Yamasaki.

He inherited his mother's deep knowledge of art, and is interested in painting. He is a member of the art club at school. When Shuuya was seven years old, his mother, Ayaka passed away in an accident during an excavation at an archaeological site. Midori, the family nanny married Mankai becoming his step mother.

He is usually blunt when talking, but he is kind at heart.

[From [url=https://www.getchu.com/soft.phtml?id=203321&gc=gc]Getchu[/url]]

- **Gender:** Male
- **Hair:** Brown
- **Eyes:** Hidden
- **Role:** Son, Boyfriend, High School Student, Non-blood-related Son, School Art Club Member
- **Engages in:** Infidelity, Netori (steals the SO), Pretend Wedding
- **Subject of:** Breakup

### Hiura Waka (日浦 和歌)
Shuuya's girlfriend. She is the only daughter of Shusaku Mikami, a famous painter.

Her father died by suicide two years ago, it was a result of an extramarital affair with a woman, and Waka is aware of this.

Since she was a child, she has seen her father sleep around with many women, and her mother constantly crying due to her father's behavior. She started referring herself with "boku" and began dressing up like a boy.

She has more male friends than female friends.

[From [url=https://www.getchu.com/soft.phtml?id=203321&gc=gc]Getchu[/url]]

- **Gender:** Female
- **Measurements:** Bust-Waist-Hips: 78-56-82cm, A cup
- **Hair:** Blue, Short, Pubic Hair
- **Clothes:** School Uniform, Sweater, Trousers, Miniskirt, Tank Top, Naked Shirt
- **Eyes:** Green
- **Personality:** Boku, Friendly, Tomboy
- **Role:** Girlfriend, Painter, High School Student, Half-orphan
- **Subject of:** Infidelity
- **Engages in:** Polyamory, Breakup
- **Body:** Medium Breasts
- **Voiced by:** Misaki Rina

### Oguni Akane (阿国 あかね)
She is Midori's older sister.

It is said that her ancestors were tayu (highest ranking courtesan) of Yoshiwara. 

She graduated at the top of her class from the medical department of Jonan University and was a legendary doctor, but at some point in her life she gave up the scalpel and became a school doctor at Shuuya's school. She is a good woman with a big sisterly heart. 

She is quite the glutton and she likes to say "My stomach is the universe".

[From [url=https://www.getchu.com/soft.phtml?id=203321&gc=gc]Getchu[/url]]

- **Gender:** Female
- **Measurements:** Bust-Waist-Hips: 107-61-88cm, I cup
- **Hair:** Blond, Long, Curtained, Pubic Hair
- **Eyes:** Violet
- **Clothes:** Earrings, Miniskirt, Thigh-high Stockings, Lab Coat
- **Personality:** Friendly, Smart, Food Lover, Observant
- **Engages in:** Smoking
- **Role:** Aunt, Domestic Partner, Medical Doctor, School Nurse, Older Sister
- **Body:** Mole, Big Breasts
- **Items:** Stethoscope
- **Voiced by:** Kodama Satomi

### Sakaki Riona (榊 里緒菜)
Shuuya's best friend and Kohei's (sort of) girlfriend.

She is one of Waka's few female friends. She is shy and always hides behind her and is always timid until Waka starts going out with Shuuya. 

They were hanging out one day and Waka confessed her feelings to Shuuya and Kouhei confessed his feelings to Riona, they both agreed.

She is extremely nearsighted and cannot see anything when she takes off her glasses.

[From [url=https://www.getchu.com/soft.phtml?id=203321&gc=gc]Getchu[/url]]

- **Gender:** Female
- **Measurements:** Bust-Waist-Hips: 98-59-86cm, H cup
- **Hair:** Brown, Long, Blunt Bangs, Twin Braids, Pubic Hair
- **Clothes:** School Uniform, Glasses, T-shirt, Sport Bloomers, Thigh-high Stockings
- **Eyes:** Violet
- **Personality:** Shy, Timid, Jealous
- **Role:** Girlfriend, Friend, High School Student
- **Engages in:** Infidelity
- **Body:** Big Breasts
- **Subject of:** Netorare (they are the stolen SO)
- **Voiced by:** Misumi

### Yamasaki Midori (山咲 みどり)
Shuuya's step mother.

When it comes to sex, it is no exaggeration to say that she loves it. However, that does not mean that she has sex with just anyone.

She may seem easygoing and childish but being a former nanny, her housework skills are perfect, and at night she can be very erotic. She also has a strong maternal instinct, and when she sees someone in trouble, she can't leave them alone.

[From [url=https://www.getchu.com/soft.phtml?id=203321&gc=gc]Getchu[/url]]

- **Gender:** Female
- **Measurements:** Bust-Waist-Hips: 108-58-85cm, I cup
- **Hair:** Blond, Shoulder-length, Pubic Hair
- **Eyes:** Blue
- **Clothes:** Apron, Kimono, Glasses, T-shirt, Sport Bloomers, Chinese Dress, Wedding Dress, One Piece Swimsuit, Nurse Uniform, Naked Apron, Blouse, Bunny Dress, Wedding Ring, Old Type School Swimsuit, Torn Pantyhose (damaged), Cupless Corset, Eye Mask, Rope Bondage Harness, Latex Thigh-high Boots
- **Personality:** Outgoing, Friendly, Assertive
- **Role:** Wife, Non-blood-related Mother
- **Engages in:** Cosplay, Infidelity, Bunnygirl Cosplay, Pretend Wedding
- **Body:** Big Breasts
- **Subject of:** Netorare (they are the stolen SO)
- **Voiced by:** Hokuto Minami

### Hiura Kimie (日浦 貴美江)
Waka's mother.

She was married to Waka's father, an art dealer she had known for a long time. She agreed to marry him even though it was his second marriage.

She is only interested in the value of the Shusaku Mikami estate. Her married life was not a happy one, it became increasingly frustrating for her because of his constant business trips without regard for his family, just as he did with his previous wife.

[From [url=https://www.getchu.com/soft.phtml?id=203321&gc=gc]Getchu[/url]]

- **Gender:** Female
- **Measurements:** Bust-Waist-Hips: 96-62-90cm, H cup
- **Hair:** Brown, Long, Curtained, Pubic Hair
- **Eyes:** Green
- **Clothes:** Apron, Skirt
- **Personality:** Friendly, Money Lover, Mature
- **Role:** Widow, Mother, Non-blood-related Mother, Lonely, Single Parent
- **Voiced by:** Houjou Asuka

### Hiura Mizuki (日浦 水樹)
[url=/c45171]Waka[/url]'s older step brother. There's more to him than meets the eye.

- **Gender:** Male
- **Hair:** Violet, Short, Spiky Bangs, Pubic Hair
- **Body:** Reverse-trap, Teen, Pale
- **Clothes:** School Uniform, Necktie, Sarashi
- **Role:** Step Brother, Step Sister, High School Student, Non-blood-related Daughter, Non-blood-related Son, Older Sister, Older Brother
- **Eyes:** Garnet
- **Voiced by:** Misumi

### Maejima Kouhei (前嶋 康平)
Riona's boyfriend, he asked her out alongside Waka who asked Shuuya out. Riona agreed out of awkwardness.

- **Gender:** Male
- **Hair:** Brown, Curtained, Short
- **Eyes:** Brown
- **Clothes:** School Uniform, Jacket
- **Personality:** Friendly
- **Role:** Boyfriend, Friend, High School Student
- **Subject of:** Infidelity, Netori (their SO is stolen)

### Takanashi Saeko (高梨 小枝子)
She is a college student, 20 years old.

She has the exact same face, hairstyle, and personality as Ayaka, the deceased mother of the protagonist.

She is a student at Jounan University and a pupil of Mankai. She is present during the excavation work in Japan.

[From [url=https://www.getchu.com/soft.phtml?id=203321&gc=gc]Getchu[/url]]

- **Gender:** Female
- **Measurements:** Bust-Waist-Hips: 86-56-88cm, E cup
- **Hair:** Blue, Long, Straight, Pubic Hair
- **Eyes:** Blue
- **Clothes:** Necktie, Skirt
- **Personality:** Outgoing, Friendly, Kind
- **Role:** Mother, University Student
- **Subject of:** Pregnancy
- **Body:** Mole
- **Voiced by:** Houjou Asuka

### Yamasaki Mankai (山咲 満開)
Esteemed Archeologist at Jounan University and Shuuya's father. He remarried Midori after the death of his first wife, Ayaka.

- **Gender:** Male
- **Eyes:** Brown
- **Clothes:** Trousers, Fedora, Glasses, Vest, Gloves, Belt
- **Body:** Muscular, Scar
- **Role:** Husband, Father, Archeologist
- **Hair:** Sideburns, Soul Patch
- **Subject of:** Infidelity

## Shops
- [Official Website](http://www.n43project.com/n43/npg51/index.html)
- [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ001575.html)
- [Getchu](http://www.getchu.com/soft.phtml?id=468185)

## Releases
### Japanese
- **2003-10-31**: Cosmamania - [Official website](https://web.archive.org/web/20040405123028fw_/http://discovery-team.jp:80/soft/cosmama/index.html), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=3096), [Getchu](http://www.getchu.com/soft.phtml?id=32366)
- **2005-09-22**: Cosmamania R - [Getchu](http://www.getchu.com/soft.phtml?id=203321)
- **2007-11-04**: Cosmamania - Download Edition - [DLsite](https://www.dlsite.com/pro/work/=/product_id/VJ001575.html), [Gyutto](https://gyutto.com/i/item2551), [Digiket](https://www.digiket.com/work/show/_data/ID=ITM0006796/), [DMM](https://dlsoft.dmm.co.jp/detail/discovery_0007/)
- **2007-12-25**: Cosmamania - DVDPG - [Official website](http://www.n43project.com/n43/npg51/index.html), [Getchu](http://www.getchu.com/soft.phtml?id=468185), [DMM](https://www.dmm.co.jp/mono/anime/-/detail/=/cid=1018npg51/)

## Tags
ADV, Simulation Game, Sister/Sister Incest, Male Protagonist, Mother Support Character, Reverse Trap Heroine, Heroine with Glasses, Map Movement, School Nurse Support Character, Group Sex of One Male and Several Females, Student Heroine, Heroine with Zettai Ryouiki, Tomboy Heroine, Big Breast Sizes Heroine, Student Protagonist, Protagonist's Non-blood-related Mother as a Heroine, Non-blood-related Mother/Son Incest, Boobjob, Cosplay, Sixty-nine, Blowjob, Heroine with Sport Bloomers, Naked Heroine with Apron, Cunnilingus, Ejaculation Choice, Cowgirl, Heroine's Mother as a Heroine, Heroine Having Sex with Others, Non-twin Heroine Sisters, High School Student Heroine, Heroine with Big Breasts, Shimaidon, Oyakodon, Nukige

## More Games from Discovery Mars
- [Cosmamania](https://pinovel.net/v2176)
- [Waimen Kyoukan -Nakadachi Taizou-](https://pinovel.net/v7819)
- [Chichi Ijime Bakunyuu Shimai Kyouentan](https://pinovel.net/v3760)
- [Tomodachi no Haha o Okasu to Iu Koto](https://pinovel.net/v7417)
- [Netorare Onna Teacher -Mihoro Sensei Ryoujoku Nisshi-](https://pinovel.net/v2420)

---
*View the full details at [pinovel.net/v2176](https://pinovel.net/v2176).*

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```