Undercity of Sin

by FullskyWorkshop/Manten Kobo

Uncensored Windows
Versionv1.02 Steam
EngineRPGM
Released2024-07-26
Updated2025-12-07
LanguageEnglish, Japanese, Chinese (Simplified)

About Undercity of Sin

Undercity of Sin is a 2D adult RPG Maker title by FullskyWorkshop/Manten Kobo, using 2D CG visuals. You play Asuna Hoshizuki, a loud, jobless dropout who has a loving mother and helps at the family restaurant. The fantasy adult premise focuses on corruption and a female protagonist.

The current build is v1.02 Steam, and development is ongoing. It was released July 26, 2024 for Windows, is uncensored, and supports English, Japanese, and Simplified Chinese.

Developer's description

Asuna Hoshizuki is beautiful, loudmouthed, and hits like a freight train. A jobless dropout, she doesn't have much of a life, but she has a loving mother and a family restaurant she helps out at. Trailer Spoiler Formerly known as "Asuna Hoshizuki and the Underground City of Lust". ​

Download Undercity of Sin v1.02 Steam

Player reviews

Player rating 3.0 / 5 · 20 ratings
Written reviews 20 · avg 3.1★
Positive (4–5★) 35%
Latest review 2026-03-24

What players say

Mixed average reception: art and adult scenes appeal, but inconsistent corruption and repetitive content frustrate many players.

5★ 1
4★ 6
3★ 6
2★ 7
1★ 0

Players like

  • Adult CGs and art are often well made
  • Standard RPGM gameplay is adequate
  • Voice acting and sound effects are appreciated
  • Battle fuck scenes are implemented competently

Common complaints

  • Corruption progression feels inconsistent or grindy
  • Content feels repetitive or half-baked
  • Story and characters feel thin or dumb

Best for players who enjoy standard RPGM corruption games with decent adult art.

Summarised from 20 written player reviews.

ZuVres 2026-03-24 ★★★★★
i though that this game was released after Exorcist Evangeline -The Engraved Lewd Crest- (same devs) but no, it was made before (around a year). it's basically the same game. almost the same h-scenes, same way to gain lewdness and…
Hachinan 2026-02-04 ★★★★★
Just has everything my heart desires and what i'm in the mood for at that moment. if any of you have a recomandation for me, my favorite tag is corruption. also if it gets uncensored please contact me here (if…
Suliceh 2026-01-01 ★★★★★
The art is decent, but the story is dumb and the FMC is somehow even dumber. The game features battle fuck, and it's better implemented than in most other games. My biggest issue with this game is that its saturated…

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