Title : Undercity of Sin
Original Title : 星月明日奈と淫欲の地下街,
Language : English (Official)
Developer : FullskyWorkshop
Released date : 2025-10-09 (en)
https://store.steampowered.com/app/3721940/

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.

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. But after a run-in with a band of yakuza, she finds herself deep in debt to a crime family. With a net worth amounting to a few loose coins and some pocket lint, she's left with no choice but to work for the very men she's indebted to. But in the process, she learns about a secret underground world, a cyberpunk city hidden from sight. Now to pay off her debt, Asuna will have to use her incredible strength to help the Matsuba Clan seize control of the crime-ridden Undercity.



Experience a story of crime and gang warfare as you fight your way through eight procedurally generated dungeons full of machine soldiers and superpowered weaponry, and explore a skill tree with numerous ways to power up your character as you overcome this traditional turn-based RPG.




A Cyberpunk Yakuza-Themed Story

Dive into a cyberpunk world and the city's dangerous underbelly! Get entangled with the yakuza and struggle to regain your freedom!

Eight Special Dungeons

Explore eight procedurally generated dungeons as you battle your way to freedom through traditional turn-based combat!

Skill Tree

Unlock passive and active skills through an expansive skill tree! Level up or use items to farm skill points and turn Asuna into an unbeatable hero!