---
title: "Sex Open World e Youkoso!"
description: "Welcome to a Sexy, Open World A brand new title from MOONSTONE Cherry, the creators of Imouto Paradise - Welcome to a Sexy, Open World!  When the young Sejima S"
image: "https://t.vndb.org/cv/26/89226.jpg"
---

# Sex Open World e Youkoso!

![Sex Open World e Youkoso!](https://t.vndb.org/cv/26/89226.jpg)

**Alternative Title:** セックスオープンワールドへようこそ！

**Aliases:** SOW

**Developer:** MOONSTONE Cherry

**Release date:** Sep 27, 2019

**Platform:** Windows

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

**Rating:** 7.0/10 (237 votes)

## Description
**Welcome to a Sexy, Open World**
A brand new title from MOONSTONE Cherry, the creators of Imouto Paradise - Welcome to a Sexy, Open World!

When the young Sejima Seiya tries to rescue a dog, the passing truck winds up sending him straight into a completely different world! In this brand new world, Seiya finds himself caught up in an ancient prophecy that someone from another world will arrive to give birth to the legendary heroes that will end the wars plaguing the lands. What is Seiya to do as key women from every major nation in this new world start accosting him for his baby batter in an attempt to ensure their nation holds the most influence over the heroes destined to be born?! Worse yet - even if Seiya wanted to avoid becoming a stud, it turns out that if he doesn't create a child to bind his presence in this new world, then he'll be pushed out of it and sent back to the moment of that fateful accident! Luckily for the unwitting father of heroes, coming to this world has given him the power to know when a woman is at her peak fertility!

**Description**
When he awakens from a terrible accident, Sejima Seiya finds himself in another world—Laurentide.

A world with a legend, long held by its people:

──The seed that shall give birth to heroes and end the era of war shall come from another world.──

Seiya has that seed within him.
And despite being viewed as breeding stock, he still wishes to have sex.
But now the father of the future heroes could become king of the world.

So...

Drawn by the legend, beautiful women gather from across the world, seeking his seed.

──Or perhaps some harbor the ambition of unifying the world under their motherland.
──Or perhaps some simply desire sex with Seiya.

Regardless, Seiya's days of getting milked by beautiful women have begun...

[From [MangaGamer](https://mangagamer.org/sexyopenworld/)]

## Characters
### Sejima Seiya (瀬島 晴哉)
The Hero

Profession: Cook
Birthplace: Tokyo, Japan
Race: Human

A man from another world. He had turned twenty without once having done it, so he got concerned.

Due to a certain incident, he finds himself flung into the parallel world of Laurentide.
Although he's never gone all the way with a woman before, he finds himself at the center of of a prophecy that is attracting many beautiful suitors. His mission is to have as much baby-making sex as possible!

- **Gender:** Male
- **Aliases:** 勇者様, Yuusha-sama, セジマ・セイヤ
- **Hair:** Brown, Short, Straight
- **Body:** Slim, Pale, Young-adult
- **Role:** Master, Hero, Husband, Father, Cook, Popular, Famous, Japanese (Expatriate)
- **Engages in:** Cooking, Fighting, Dimensional Travel, Polygamy, Competition
- **Clothes:** Shirt
- **Personality:** Friendly, Altruistic, Protective, Lucky
- **Subject of:** Being Drugged

### Alencia Yonah Elborg (アーレンシア・ヨナ・エルボーグ)
The proud female knight of the Empire.

Profession: Knight of the Imperial Guard
Country: The Holy Imperium, Valhalla
Race: Human
Height: Slightly tall
Breast size: Big

Under instruction from their gods, the great western empire of Valhalla seeks to broaden its' lands.
In Valhalla, Alencia holds the vaulted position of "Head of the First Order of Imperial Knights, in Guard of Her Royal Princess", which is to say she is the strongest knight.
In order to further spread the influence of Valhalla's gods across the world, she travels to Laurentia, to take the hero's seed.

Her pride is excessive, to say the least, and her tendency to shout "I'll kill you for that!" at the slightest provocation tends to make those around her quite ill at ease.
While she was rather curt with the protagonist at the start, after he saved her from an energetic orc, she quickly finds herself falling for him.

「Though I know it's for the Empire, to have to take the seed of a pitiful man such as yourself... I'd just as soon kill you.」

- **Gender:** Female
- **Hair:** Blond, Long, Waist Length+, Straight, Braid, V Bangs, Tiny Braid
- **Body:** Teen, Slim, Pale, Huge Breasts
- **Items:** Sword, Diary, Rapier
- **Engages in:** Swordsmanship, Fighting, Drinking, Riding
- **Eyes:** Blue
- **Clothes:** Hair Ribbon, Headband, Gauntlet, Plate Armor, Cape, Cravat, Ribbon Hair Accessory, Decorative Belt, Spaulders, Tassets, Crotchless Micro Bikini, Sabaton, Armored Panties
- **Personality:** Tsundere, Low Self-esteem, Strict, Honorable, Patriotic, Loyal, Confident, Competitive
- **Role:** Wife, Knight, Foreigner, Coach, Royal Guard
- **Subject of:** Pregnancy, Stalking, Fainting, Bridal Carry, Claustrophobia
- **Voiced by:** Akashi Yuki

### Anna Heiritte (アンナ・ハイリッテ)
The girl who, even at first meeting, treats you like a long lost friend.

Profession: Poster girl for "The Peaceful Arbor of the Wolf"
Country: The Center of the World, Laurentia.
Race: Human (Quarter Nymph)
Height: About average
Breast size: Big.

The Republic of Laurentia is the center most country, and hub of the world.
At the center of the Laurentia lies the city of Essenbaum, and it is there that Anna works as a restaurant waitress.
With amazing looks and a personality to match, she has received no end of interested courtiers, but somehow none of them ever sparked her interest.
And so, as much as the marriage proposals keep fluttering in, she has never yet known love.

Her own lack of love actually had her secretly worried, but then an accident happens and she is saved by the protagonist...
Just like that, for the very first time in her life, she feels a certain throbbing from her womb.

「I'll do my best! I'll give it my all, and give birth to a strong and healthy child for you!」

- **Gender:** Female
- **Hair:** Ahoge, Waist Length+, Straight, Grey, V Bangs, Sidehair
- **Body:** Teen, Slim, Pale, Huge Breasts
- **Engages in:** Cooking, Lactation, Drugging
- **Eyes:** Blue
- **Clothes:** Miniskirt, Sandals, Bandanna, Hair Flower, Clothing with Ribbons, Waitstaff Uniform
- **Personality:** Deredere, Friendly, Kind, Watashi, Humble
- **Role:** Wife, Daughter, Full Sister, Waitstaff, Kanban Musume, Popular, Younger Sister, Half-breed, Nymph
- **Subject of:** Pregnancy, Reincarnation
- **Voiced by:** Manome Ruka

### Ehlitte (エーリッテ)
The listless Princess who has an immense interest in the erotic?

Profession: Princess
Country: The distant realm of Elfheim
Race: Elf
Height: Tall
Breast size: Smaller than others, yes, but still quite big

In the far off kingdom of Elfheim, the elves live in peace and harmony. Under instruction from the King who desires nothing but peace, the princess Eritte arrives to receive the seed of the hero.

Though rather somber and always bringing a downer mood to those around her, Eritte actually really loves lewd things.
She also really loves the protagonist, who managed to become her very first partner. 

Elves being elves, they spend most of their time living in the forest... which makes them a little lacking when it comes to common sense. As a member of Royalty, she bears no family name.

「Guess there's no way around it... It's for the peace of the world and all that. I'll bear your child...」

- **Gender:** Female
- **Hair:** Blond, Waist Length+, Straight, Parted in Middle, Tiny Braid
- **Body:** Teen, Slim, Pale, Pointed Ears, Huge Breasts
- **Role:** Magician, Wife, Daughter, Princess, Foreigner, Elf, Living Alone
- **Eyes:** Amber, Jitome
- **Clothes:** Evening Gloves, Boots, Thigh-high Stockings, Belt, No Panties, Forehead Necklace, Capelet, Breast Curtains
- **Engages in:** Medication, Lactation, Reading, Drugging
- **Subject of:** Pregnancy
- **Personality:** Kind, Nature Lover, Curious, Watashi, Closet Pervert
- **Voiced by:** Yahiro Mami

### Elda Heiritte (エルダ・ハイリッテ)
The beauty who's a genuine star, yet still manages to be good humored and kind

Profession: Dancer
Country: The Center of the World, Laurentia
Race: Human (Quarter Nymph)
Height: Tall
Breast size: Extremely big.

The biggest theater in Essenbaum (and thus also the biggest theatre in the entire world) is the "Golden Theatre".
To take the stage there is the highest honor a performer could hope to achieve, and of all the theatre's performers, its number one star is Elda, the Dancer.
Up until now, the stage was all that Elda ever thought about, to the point that she avoided associating with men.
However, on meeting the hero she starts to think "Marriage and having children, maybe those could be good, too?"

She is Anna's elder sister, and the two have a really good relationship together.
Since she's a quarter forest nymph, there are some who theorize it's her magical Nymph charm which makes her dancing as appealing as it is.

「If it's for you, and for your child, I have no problem giving up my life as a dancer.」

- **Gender:** Female
- **Hair:** Red, Waist Length+, Straight, Parted to Side, Sidehair
- **Body:** Teen, Slim, Pale, Huge Breasts, Tall
- **Engages in:** Cooking, Lactation
- **Eyes:** Blue
- **Clothes:** Necklace, Bikini, Bracelet, Veil, Pareo, Forehead Jewellery
- **Role:** Wife, Daughter, Full Sister, Popular, Famous, Dancer, Older Sister, Living Alone, Half-breed, Nymph
- **Subject of:** Pregnancy
- **Personality:** Energetic, Confident, Assertive, Watashi, Sleepyhead
- **Voiced by:** Kitano Ari

### Kashima Hikari (カシマ・ヒカリ)
The tough female swordswoman with the urge to breed♥

Profession: Samurai
Country: The island of the rising sun, Akitsushima
Race: Human
Height: A little short
Breast Size: Big

While the country does not boast much in the way of power, the people of Akitsushima are a warrior race, who hold pride in the fact that their country has never once been defeated since its' creation. In all of Akitsushima, the girl Kashima Hikari alone is feared as the strongest at the sword. For the sake of her country, she has traveled to Laurentia to steal the seed of the hero. 

She challenges the hero to a duel, but the power of the hero reaches directly to her (to her womb), and she inadvertently drops her katana. But for samurai of Akitsushima, one's katana is an object more important than their life. As such, Hikari admits her defeat.

「The man who knocks me up, he must be none other than the strongest man in all the world!」

- **Gender:** Female
- **Hair:** Black, Ponytail, Hime Cut, Straight, Blunt Bangs, Ankle Length, Sidehair
- **Body:** Teen, Slim, Pale, Huge Breasts
- **Engages in:** Swordsmanship, Cooking, Fighting, Lactation, Competition
- **Eyes:** Red
- **Items:** Katana
- **Personality:** Deredere, Honorable, Patriotic, Serious, Honest, Watashi
- **Role:** Wife, Samurai, Foreigner, Coach
- **Subject of:** Pregnancy
- **Clothes:** No Panties, Body Ribbon, Ribbon Hair Tie, Bridal Gauntlet, Magatama, Spaulders, Ornament Hanging from Clothes, Detached Kimono Sleeves
- **Voiced by:** Yomogi Kasumi

### Madellie Parnepoli (マドリー・パルネポリ)
The Goddess who's given up on men.

Profession: Right now? Flower vendor. Before? Priestess.
Country: The promised land of Sumerian
Race: Diva (demigod)
Height: Average
Breast size: Extremely big

Long, long ago, before humanity even knew how to write, existed Sumerian. The land granted by the gods. In that land, prostitutes are revered as priests...
But even though that is true, Madorie still would rather not embrace a man she does not love. And so, possessing only the clothes on her back, she fled from Sumerian, all the way to Essenbaum. There she has her fated encounter with the protagonist.

With an existence like that of a goddess, Diva women have given up on men as husbands, yet still seem to possess overflowing love and maternal affection...

「Alright, let's you and I make children♥」

- **Gender:** Female
- **Hair:** Black, Violet, Waist Length+, Wavy, Parted to Side
- **Body:** Teen, Slim, Dark, Huge Breasts
- **Eyes:** Amber, Tareme
- **Clothes:** Dress, Necklace, Hair Flower, Cape, Armband, Arm Cuffs, Ornament Hanging from Clothes, Breast Curtains
- **Role:** Wife, Foreigner, Living Alone, Florist, Demigod
- **Subject of:** Pregnancy
- **Personality:** Kind, Nature Lover, Watakushi, Baby Complex, Romantic
- **Engages in:** Lactation
- **Voiced by:** Hanazawa Sakura

### Makibashira Yuuna (真木柱 夕奈)
The wandering fortune teller.

Profession: Fortune Teller
Country: The Women's Autonomous Commune of Yoshinohara
Race: Youko
Height: A little short
Breasts: Big

Whatever a man's heredity or position may be, whatever his rank or social status may be, the moment he steps foot past the gate to Yoshinohara he is stripped of all of them until he is nothing more than yet another naked male. In this autonomous community of Yoshinohara, Yuuna befriends the prostitutes whose troubles are so many, and runs a business at divination and fortune telling. Her magical abilities are so strong, she has gained a reputation at being able to divine most anything; from the identity of your lover's adulterous partner to that thing you lost and have been looking for, she can find it all.

As a native of Yoshinohara, Yuuna's speech tends to reflect that used by the courtesans and prostitutes she lives with, though she herself is no lady of the night. She hears rumors about the Hero Who'd Be a Father, and decides head to Laurentia to maybe go tell him his fortune. Though... for all her ability at telling the fortune's of others, she has never been able to tell her own future.

「If it's you and I, master, no doubt I'll give birth to a beautiful gem of a child.」

- **Gender:** Female
- **Hair:** Pink, Ponytail, Long, Straight, Side Tail, Sidehair
- **Body:** Teen, Slim, Pale, Kemonomimi, Nail Polish, Furry Tail, Huge Breasts
- **Engages in:** Cooking, Lactation
- **Eyes:** Violet, Jitome
- **Personality:** Carefree, Relaxed, Archaic Dialect, Wachiki
- **Role:** Wife, Foreigner, Fox, Living Alone, Fortune Teller, Japanese (Expatriate)
- **Subject of:** Pregnancy
- **Items:** Smoking Pipe, Crystal Ball
- **Clothes:** No Panties, Kanzashi, Zouri, Forward Knot Obi, Off-The-Shoulder Furisode
- **Voiced by:** Yamato Sakura

### Joshua Hylitte (ジョシュア・ハイリッテ)
- **Gender:** Male
- **Hair:** Blond
- **Body:** Adult, Muscular
- **Role:** Widower, Father, Cook, Shopkeeper
- **Personality:** Loyal
- **Eyes:** Cyan, Hosome
- **Voiced by:** Azuma Kyousuke

### Pochizou (ポチゾウ)
- **Gender:** Male
- **Personality:** Pervert
- **Subject of:** Accident, Reincarnation
- **Role:** Nameable, Dog, Bisexual
- **Voiced by:** Sakurakouji Mai

### Anna (杏奈)
[url=https://vndb.org/c83601]Seiya[/url]'s childhood friend who died in a traffic accident. [spoiler] She reincarnates as [url=/c83599]Anna Hylitte[/url]. [/spoiler]

- **Gender:** Female
- **Hair:** Ahoge, Short, Straight
- **Body:** Teen, Slim, Pale, Big Breasts
- **Personality:** Deredere, Kind
- **Subject of:** Accident, Death, Reincarnation
- **Role:** Childhood Friend
- **Clothes:** Hairpin, Hair Flower, Sailor School Uniform

### Ester (エステル)
- **Gender:** Female
- **Aliases:** The First Princess of Valhalla, ヴァルハラ帝国・第一皇女
- **Hair:** Long, Cyan, Sidehair
- **Body:** Slim, Pale
- **Eyes:** Hidden
- **Role:** Princess
- **Clothes:** Detached Sleeves, Cape, Veil
- **Voiced by:** Matsuoka Yuuri

## Shops
- [Official Website](https://www.moon-stone.jp/product2/msc01/)
- [Steam](https://store.steampowered.com/app/3306310/)

## Releases
### Japanese
- **2019-08-09**: Sex Open World e Youkoso! - Trial Edition - [Official website](https://www.moon-stone.jp/product2/msc01/msc01_download.html)
- **2019-09-27**: Sex Open World e Youkoso! - Package Edition - [Official website](https://www.moon-stone.jp/product2/msc01/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=28031)
- **2019-09-27**: Sex Open World e Youkoso! - Download Edition - [Official website](https://www.moon-stone.jp/product2/msc01/), [ErogameScape](https://erogamescape.dyndns.org/~ap2/ero/toukei_kaiseki/game.php?game=28031), [DMM](https://dlsoft.dmm.co.jp/detail/moonstn_0015/)
- **2022-04-01**: Sex World e Youkoso! W Pack - [DMM](https://dlsoft.dmm.co.jp/detail/moonstn_0024pack/)
- **2022-04-01**: Sex World e Youkoso! Maternity Dress Append Patch - [Official website](https://www.moon-stone.jp/product2/msc01/msc01_campaign_reserve1.html), [DMM](https://dlsoft.dmm.co.jp/detail/moonstn_0025/)

### Chinese (simplified)
- **2021-02-01**: Huanying Laidao Xingai Kaifang de Shijie !

### English
- **2024-12-19**: Welcome to a Sexy, Open World - [Official website](https://mangagamer.org/sexyopenworld/), [Steam](https://store.steampowered.com/app/3306310/), [SteamDB](https://steamdb.info/app/3306310/info/), [MangaGamer](https://www.mangagamer.com/r18/detail.php?product_code=1457)
- **2025-07-07**: Welcome to a Sexy, Open World - USB Physical Edition - [Official website](https://mangagamer.org/sexyopenworld/), [MangaGamer](https://www.mangagamer.com/r18/detail.php?product_code=340)

## Tags
Fantasy, ADV, Knight Heroine, Kitsune Heroine, Goddess Heroine, Male Protagonist, Deredere Heroine, Nukige, Princess Heroine, Elf Heroine, Pregnancy, Pregnant Sex, Sword Wielding Heroine, Dark Skinned Heroine, Tsundere Heroine, Defloration, Only Virgin Heroines, Waitress Heroine, Missionary Position, Sixty-nine, Impregnation, Lactation During Sex, Cunnilingus, More Than Seven Endings, Doggy Style, Dancer Heroine, Cowgirl, Reverse Cowgirl, Defloration During Common Route, Standing Sex, Sitting Sex, Spoons, Piledriver, Background Moans, Reverse Missionary, Quickie Fix Position, Protagonist from a Different World, Perverted Heroine, Heroine with Baby Complex, Adult Breast Sucking, Bunnygirl Cosplay, Nursing Handjob, Single Boobjob, Single Handjob, Single Blowjob, Vaginal Fingering, Non-twin Heroine Sisters, Sex with Protagonist Only, Heroine with Huge Breasts, Onna Bugeisha Heroine, Harem Ending

## More Games from MOONSTONE Cherry
- [Icha Pri! ~Ojou-sama to Icha Love Ecchi na Mainichi~](https://pinovel.net/v2717)
- [Imouto Paradise! ~Onii-chan to Gonin no Imouto no Ecchi Shimakuri na Mainichi~](https://pinovel.net/v5295)
- [Houkago ☆ Eroge Bu! ~Eroge Seisaku no Tame Onna no Ko-tachi to Ecchi Shimakuri na Mainichi~](https://pinovel.net/v8170)
- [Imouto Paradise! 2 ~Onii-chan to Gonin no Imouto no Mo~tto! Ecchi Shimakuri na Mainichi~](https://pinovel.net/v11920)
- [Demon Busters ~Ecchi na Ecchi na Demon Taiji~](https://pinovel.net/v15492)
- [Imouto Paradise! 3 ~Onii-chan to Gonin no Imouto no Sugo~ku! Ecchi Shimakuri na Mainichi~](https://pinovel.net/v21766)
- [Sex Open World e Youkoso!](https://pinovel.net/v25942)
- [Sex Underworld e Youkoso!](https://pinovel.net/v29936)
- [Yuunagi-sou no S-kyuu no Kanojo-tachi](https://pinovel.net/v37083)
- [Yuunagi-sou no S-kyuu no Kanojo-tachi 2](https://pinovel.net/v47110)
- [Homerarete Nobiru SR Shoujo-tachi](https://pinovel.net/v55256)

---
*View the full details at [pinovel.net/v25942](https://pinovel.net/v25942).*

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