Lost in Endoria: Monster Girls is a fantasy game by Yukari-chan, made with the Others engine and presented through animated visuals. You play a frail nerdy man transported to a world of monster girls. He is the only male there, and the monster girls can become stronger through his semen. The story asks whether they will free him or keep him bound, and whether he will search for the missing woman who might help him return home or face the unknown alone.
Development is ongoing. It is available on Windows, Linux, Mac, and Android in English, without censorship, as the full build v0.9.50a dated May 6, 2025. The latest update adds Day 8 Part 2, Day 8 quests, a Scorpion girl enemy with animated lewd scenes, and a gallery for unlocked NSFW scenes. It also fixes repeated battle card use with keyboard and some scenes that did not load correctly.
Developer's description
What would happen if a frail nerdy guy got transported and isekai’d into a world full of monster girls?
And what would happen if they all figured out that this nerdy guy, the only male in their world,
has the power to make every monster girl strong by eating his semen?
Will they free him and allow him to return to his world?
Spoiler
Or will they lock him up and use him to strengthen their powers to dominate the world?
And what will you do if the only one who can help you return to your world is gone?
Will you look for her? Or will you traverse the unknown world alone to find your way back home?
Lost in Endoria: Monster Girls screenshots
Download Lost in Endoria: Monster Girls v0.9.50a Full
v0.9.50a
New Content:
Day 8 Part 2 added
Day 8 quests
New enemy monster girl (Scorpion girl)
New animated lewd scenes (Scorpion girl)
Gallery feature to view unlocked NSFW scenes.
Fixes:
Battle cards can be spammed when playing with keyboard.
Some scenes not loading properly.
v0.9.07b
Day 8:
Story, Part 1
Battle:
Unlock new cards by performing certain consecutive actions in battle.
Map:
Added new character sprites to the map:
Rina
Lúthien
Aveley
Eryn
Farmer
Seqei
Mindie
Fixes/Adjustments:
(It is recommended to create a new save file to avoid potential freezes or crashes from previous saves.)
Map navigation:
Polished and revised the map layout.
Polished map navigation and entrance/exit animations for visual novel avatars.
Fixed instances where locations remained inaccessible even after being Fixed instances where map characters did not appear or were not clickable.
Fixed restrictions on map access, time, quest, and story progression.
Battle:
Fixed the Daydream card so it removes only debuffs, not buffs.
Gameplay:
Temporarily removed the ability to load saves during gameplay. This measure may help prevent potential bugs while we develop a new approach for managing multiple save files.
v0.8.95d
BUGFIXES
I worked on fixing and adjusting some visual novel avatars and visual effects.
Monster enemies can now use
SHIELDS.
A new animation called
“DEFEND”
is added during the monster battle alongside the ATTACK, HURT, IDLE, AND DODGE features.
The battle sound effects of some monsters play in a loop.
I also worked on improving lewd scenes fps.
Map: Some map locations are locked even when the quest for the location is already unlocked.
UPDATED CONTENT
BATTLE:
Added Tutorial via "How to play" button in battle.
Battle scene UI adjustments have been made to make the game more appealing.
In the DEMO VERSION, I extended the content and made it longer compared to the first demo version. You can now enjoy playing the game for free, starting from Prologue to Day 1.
New content has been added, too. I added Day 7 alongside a challenging quest.
You will also face a new monster girl enemy with Beetlegirl, along with its animated lewd scenes.
Demo
- Initial Release
Player reviews
Player rating1.0 / 5 · 4 ratings
Written reviews4 · avg 2.0★
Positive (4–5★)25%
Latest review2025-08-02
What players say
One positive review praises art and charm, but most reviewers call it unfinished and poorly written.
5★1
4★0
3★0
2★0
1★3
Players like
Artwork and graphics are acceptable or nice
The idea and charm show author's passion
Sound is pleasant
Common complaints
Dialogue is repetitive, weak, and not fun to read
Content feels unfinished, sparse, and padded
Choices, tutorials, and audio options lack impact
Best for players who like decent art and sound but tolerate weak writing.
Summarised from 4 written player reviews.
nb82025-08-02★★★★★
oh, this is not a game, but some alpha version, there are only 2 scenes and this is from 2023! why does this even exist? the graphics are not bad, but they just don't exist, a waste of time, and…
Escapar2025-08-01★★★★★
The game isn't THAT bad, so don't listen to people below, better try it yourself first and make your own opinion. Art is ok, sound is nice. Dialogs are a little weak, but it's not the end of the world…
V KO D 6932023-08-22★★★★★
idea is great, execution is lacking, artwork is nice, game does not run smoothly- as in- not physical machine performance lacking, but the game design direction. Choices don't actually matter, so much talking, and starting area is counter intuitive to…
★★★★★(4)
