Game overview
Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea-
This Cthulhu Mythos RPG is a retro styled horror RPG containing modern elements. What terrors await you in the abandoned mansion...? Create the protagonist "YOU" to your liking. Select your companions and unravel the mystery of the mansion.
- Last tracked players
- 0
- Recorded peak
- 2
- 24-hour change
- Unavailable
- Steam reviews
- 91.3% positive 23 reviews · via SteamSpy
Delayed observation · last tracked . Values marked unavailable are not estimated. Recorded peak is the highest player count observed by SteamIQHQ; earlier records may be outside our coverage.
About this game Read the full description
"Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea-" is a retro styled horror RPG containing modern elements from the Cthulhu Mythos universe.
It is summer and with your friends you have make your way to an abandoned mansion deep in the mountains to enjoy your youth and make long lasting memories.
With your companions by your side, overcome the terror awaiting you and unravel the secrets of the mansion.
High parameters but lacking in skills.
Low parameters but an abundance of skills.
Create the protagonist to your liking and stand up against the terror.
The member you like, a member good at fighting, a member good at exploring.
Depending on who you choose, the experience you have may change drastically.
If you run out of healing items or the enemies are just far too strong... you can give up, go home and attempt to explore the mansion from the beginning with your current level.
(You can do this even if you are defeated in battle = Game Over.)
Also, by unlocking certain achievements in game, the protagonist will gain a bonus to their parameters when you start a new game.
Take one step back and two steps forward. Giving up and starting over is an essential element to eventually discovering the truth...
[Story]
You, the protagonist, are 2nd year high school student.It is summer and with your friends you have make your way to an abandoned mansion deep in the mountains to enjoy your youth and make long lasting memories.
With your companions by your side, overcome the terror awaiting you and unravel the secrets of the mansion.
[Protagonist: "YOU"]
Gender, name, parameters, skills... you can customize them all.High parameters but lacking in skills.
Low parameters but an abundance of skills.
Create the protagonist to your liking and stand up against the terror.
[Choosing your companions is KEY!]
Of the 5 companions you can only select 2 to explore with you.The member you like, a member good at fighting, a member good at exploring.
Depending on who you choose, the experience you have may change drastically.
[New Game Plus]
When the story proceeds you have the option to exit the mansion at any time.If you run out of healing items or the enemies are just far too strong... you can give up, go home and attempt to explore the mansion from the beginning with your current level.
(You can do this even if you are defeated in battle = Game Over.)
Also, by unlocking certain achievements in game, the protagonist will gain a bonus to their parameters when you start a new game.
Take one step back and two steps forward. Giving up and starting over is an essential element to eventually discovering the truth...
Media gallery 10 screenshots · 0 videos
Screenshots
And 2 more screenshots...
Player activity
Concurrent players over the last 48 hours.
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System requirements Windows
Windows
Minimum
Minimum:- OS *: Windows7/8/10
- Processor: 1GHz
- Memory: 256 MB RAM
- DirectX: Version 9.0
- Storage: 80 MB available space
Game details Languages, features & support
- Publisher
- DLsite
- Brazilian rating
- 14
- Steam Germany rating
- 16
- Controller support
- partial
- Features
- Single-player, Partial Controller Support, Steam Cloud, Family Sharing
- Languages
- English
- Support
- [email protected]
Compatibility & accessibility Steam Deck, controllers & access features
Can I Play This?
Steam declarations and Valve's Steam Deck compatibility result. Missing data is shown as unknown, never unsupported.
Native Steam builds
Windows: unknown
macOS: unknown
Linux: unknown
Steam Deck
playable
Valve compatibility test
Input
Controller support: unknown
Structured language support (1)
| Language | Interface | Full audio | Subtitles |
|---|---|---|---|
| English | Yes | No | Yes |
Steam store page
fresh · checked 2026-10-31
PCGamingWiki technical notes
External link only; SteamIQHQ does not ingest PCGamingWiki content.
More analysis Activity patterns, updates & developer tools
Genre Benchmarks
Player Count
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Value Ratio
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Activity Heatmap
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Developer Analytics
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Frequently Asked Questions
What is the recorded Steam price for Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea-?
The last observed Steam price for Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea- is $6.99. Check Steam for current pricing and availability.
What genre is Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea-?
Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea- is a Indie, RPG game.
Who developed Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea-?
Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea- was developed by AlchemyBlue and published by DLsite.
What platforms does Cthulhu Mythos RPG -The Sleeping Girl of the Miasma Sea- support?
Available on Steam for Windows.
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