Sex Open World e Youkoso!


Sex Open World e Youkoso!
TitleSex Open World e Youkoso!
Original titleセックスオープンワールドへようこそ!
LengthMedium (10 - 30 hours)
DeveloperMoonstone Cherry
LinksWikidata, VNStat


Thanks to an accident, our protagonist 'Sejima Seiya' awakes to find himself in the parallel world of "Rolentide". In the land of Rolentide, there is an ancient legend which has been long held by the people...

-From a hero who arrives from a parallel world shall come the seed which will end the Era of War-

There is no doubt that the seed spoken thereof is that of our protagonist. "What am I, a stud horse!?" the hero thinks to himself, yet even be that as it may, our protagonist can't help but want to do it. And besides, to become the father of heroes is to become king of the world. And so it goes...

Led by the legend, beautiful women from all over the world begin to converge in order to claim our protagonists' seed.

...Maybe these heroines secretly desire to unite the world under their country's banner.
...Or maybe they just want to have sex with the hero.

Our main character's days of being exploited by beautiful women begin now...

[Translated from Getchu]

Hide spoilersShow minor spoilersSpoil me! | Show sexual traits


Sejima Seiya瀬島 晴哉
HairBrown, Short, Straight
BodyAverage Height, Pale, Slim, Young-adult
PersonalityAltruistic, Friendly, Kind, Lucky
RoleCook, Famous, Hero, Japanese (Expatriate), Popular
Engages inCompetition, Cooking, Dimensional Travel, Fighting


The protagonist

Profession: Cook
Country: Japan. Specifically, Tokyo
Race: Human

The main character. Having already turned twenty without once having done it, he's getting a little concerned.
He'ss actually rather popular among women, but there is a reason for that.
Due to a certain incident, he finds himself flung into the parallel world of Rolentide.
Although he's never gone all the way with a woman before, now he must go all out to have baby making sex.

Main characters

Alencia Jonah Elborgアーレンシア・ヨナ・エルボーグ
HairBlond, Braid, Straight, Tiny Braid, V Bangs, Waist Length+
BodyAverage Height, Big Ass, Huge Breasts, Pale, Slim, Teen
ClothesArmored Panties, Cape, Cravat, Decorative Belt, Gauntlet, Headband, Plate Armor, Ribbon Hair Accessory, Sabaton, Spaulders, Tassets
PersonalityConfident, Honorable, Loyal, Patriotic, Tsundere
RoleHorse, Knight
Subject ofBridal Carry, Fainting
Voiced byAkashi Yuki


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.」

Anna Hylitteアンナ・ハイリッテ
HairAhoge, Grey, Sidehair, V Bangs, Waist Length+
EyesBlue, Tareme
BodyAverage Height, Big Ass, Huge Breasts, Pale, Slim, Teen
ClothesHair Flower
PersonalityDeredere, Friendly, Kind, Watashi
RoleKanban Musume, Popular, Waitstaff, Younger Sister
Subject ofPregnancy
Voiced byManome Ruka


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!」

Elda Hylitteエルダ・ハイリッテ
HairParted to Side, Red, Sidehair, Straight, Waist Length+
BodyAverage Height, Big Ass, Huge Breasts, Pale, Slim, Teen
ClothesBikini, Necklace, Pareo, Veil
RoleDancer, Full Sister, Older Sister
Voiced byKitano Ari


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 protagonist 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.」

HairBlond, Parted in Middle
EyesAmber, Jitome
BodyBig Ass, Big Breast Sizes, Pale, Pointed Ears, Slim, Teen
RoleElf, Princess
Subject ofPregnancy
Voiced byYahiro Mami


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...」

Kashima Hikariカシマ・ヒカリ
HairAnkle Length, Black, Blunt Bangs, Hime Cut, Ponytail, Sidehair, Straight
BodyAverage Height, Big Ass, Huge Breasts, Pale, Slim, Teen
ClothesBridal Gauntlet, Detached Sleeves, Ornament Hanging from Clothes, Ribbon Hair Tie, Spaulders
PersonalityHonest, Honorable, Patriotic, Serious, Watashi
RoleCoach, Japanese (Expatriate), Samurai
Engages inCompetition, Fighting, Swordsmanship
Voiced byYomogi Kasumi


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 protagonist to a duel, but the power of the hero reaches directly to her (to her womb), and she inadvertantly 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!」

Madellie Parnepoliマドリー・パルネポリ
HairBlack, Parted to Side, Violet, Wavy
EyesAmber, Tareme
BodyBig Ass, Dark, Huge Breasts, Slim, Teen
ClothesHair Flower
PersonalityKind, Watakushi
RoleDemigod, Florist
Subject ofPregnancy
Voiced byHanazawa Sakura


The Goddess who's given up on men.

Profession: Right now? Flower vendor. Before? Priestess.
Country: The promised land of Sumerian
Race: Deva (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, Deva 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♥」

Makibashira Yuuna真木柱 夕奈
HairLong, Pink, Ponytail, Sidehair, Side Tail, Straight
EyesJitome, Violet
BodyBig Ass, Furry Tail, Huge Breasts, Kemonomimi, Nail Polish, Pale, Slim, Teen
ClothesKanzashi, Off-The-Shoulder Furisode
ItemsCrystal Ball, Smoking Pipe
PersonalityArchaic Dialect, Carefree, Relaxed
RoleFortune Teller, Fox, High-class Prostitute
Subject ofPregnancy
Voiced byYamato Sakura


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.」

Side characters

Make an appearance

AliasesThe First Princess of Valhalla, ヴァルハラ帝国・第一皇女
HairCyan, Long, Sidehair
BodyAverage Height, Pale, Slim
ClothesCape, Detached Sleeves, Veil