Cthulhu Mythos ADV 呪禍に沈む島

On a mysterious island in the Seto Inland Sea, an urban legend tells that completing the "88 Temples Pilgrimage" will summon Kukai, who will grant your wish. Our protagonist, visiting this island, is suddenly cursed by an unknown entity, putting their life in jeopardy. Can they prevent the resurrection of an ancient evil god sealed on the island and break the curse?


・Player Stats and Appearance Customization

Answer questions to shape your protagonist’s stats.
Enjoy thrilling dice rolls with challenging stats, and for an added layer of immersion, you can even replace the protagonist’s image.

・Dice Roll Choices

In critical moments, the outcome of choices is determined by dice rolls. The success rate depends on the abilities of the protagonist and their companions. Sometimes, you will face scenes where you must succeed within a time limit!

・Effects of the Curse

As you explore the island, hunger triggers terrifying seizures and lowers your dice roll success rates. Beware the curse!

・Branching Storylines

The latter part of the story branches significantly based on the protagonist's sanity and bonds with other characters. Your decisions matter!


Hatsumi Amasawa CV:Mayu Mineda
A friend of the protagonist and a university student.
Cheerful and friendly with everyone, likely due to her good upbringing.
Has a fondness for occult content like horror and urban legends.


Reiji Kaga CV:Haruki Ishiya
A friend of the protagonist and a university student.
Although he excels academically, he postpones job hunting to focus on his hobbies and part-time jobs.
While his interests in horse racing and pachinko haven't yielded great results, his excellent memory and insight make him unbeatable at mahjong.


Hotaru Natsunagi CV:Yuki Tanaka
A girl living on the island.
Due to her frail health, she's never left the island and yearns for city life.
After an unexpected encounter with the protagonist, the wheel of fate for both her and the island begins to turn.


Yukitsune Saeki CV:Yuya Hirose
A young man living on the island.
Possesses mysterious powers and spends his days helping others.
Claims the protagonist is his "destined person," but his true intentions remain unclear.


Keiyū Natsunagi CV:Hidenobu Kiuchi
Hotaru’s father.



How to Change the Protagonist's Image
Steps to Update Player Image

1. Open the game's page on Steam.

2. Ensure the game is installed.

3. Click the gear icon on the right side of the screen and select "Manage," then "Browse Local Files." This will open the folder containing the game's files.

4. Place the images in the Jukashima_Data/StreamingAssets/player folder. Ensure the images adhere to the specified size and file naming conventions to be displayed correctly in the game.


Image Specifications
Size: 1920x1080 pixels
File Format: PNG with a transparent background
Number of Images: 11 (for different facial expressions)
File Names:
・tsujo.png
・odoroki.png
・kyouki.png
・hohoemi.png
・egao.png
・aseri.png
・hensou.png
・hensou_aseri.png
・ikari.png
・kanashimi.png
・fushin.png
Note: "hensou" is displayed during undercover investigations. Enjoy preparing your favorite disguise illustrations.


Japanese, English