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Underdark: Prisoner Monster Girl Isekai [v0.01 Remaster] [The Sin Workshop]

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3.0 Rating 33 Views Updated Sep 25, 2026

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A young archaeologist, during an expedition, accidentally falls through an ancient portal into a completely alien and dangerous underground world.Without

A young archaeologist, during an expedition, accidentally falls through an ancient portal into a completely alien and dangerous underground world.
Without weapons, without friends, and with no idea how to get back home, he finds himself in a brutal reality where humans are a rare and valuable commodity.
Now he must survive in a dark fantasy world filled with demons, ancient magic,
and creatures that look at him with hungry interest.
Gradually, the protagonist begins to realize that there may be no way back… and that this world is slowly but surely changing him.

Thread Updated: 2026-07-26

Release Date: 2026-07-26

Developer: The Sin Workshop – Patreon

Censored: No

Version: 0.01 Remaster

OS: Windows, Linux, Mac, Android

Language: English

Other Games: Link

Genre:

3DCG, Animated, Male Protagonist, Mobile Game, Anal Sex, Female domination, Futa/Trans, Slave, Vaginal sex, Adventure, Fantasy, Monster Girl,

Planned: Multiple endings