Sickness

A dark visual novel about a student's descent into crime

Zetsubou · Published by Unwonted Studios, Zetsubou · Released Jan 20, 2016

Reviews: Very Positive; 90% of 96
Recent reviews: Not enough recent
Players: 0; daily peak, Oct 28, 2026
Steam Deck: Verified
Last update on Steam: 1 year ago; Feb 23, 2025
Minimum PC: DirectX; 1 GB RAM · 2 GB disk; Full requirements

What is Sickness?

In this single-player visual novel, you read the story of Suoh, a high school student trying to support his twin sister after their parents die. They move to another city, where he becomes a hired killer and conceals his work from her.

For you if...

+you enjoy making choices that affect the story's outcome

Not for you if...

−you avoid stories involving incest and strong language
−you want action-focused play rather than extended reading

What players say

90% of 96 reviews are positive

Players praise the story and its character development. Common complaints include slow pacing, plot holes, and characters or routes that feel underdeveloped.

Screenshots and trailer

Sickness system requirements

Minimum: DirectX, 1 GB RAM, 2 GB of disk space.

As published by the developer.

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Minimum

OS: Windows XP
Processor: 1Ghz
Graphics: DirectX or OpenGL compatible card (capable of 1080p output)
Memory: 1 GB RAM
Storage: 2 GB available space

Does Sickness have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does Sickness run on Steam Deck?

Verified Yes, Verified by Valve: it works on Steam Deck out of the box.

All functionality is accessible with the default controller configuration
In-game text is legible on Steam Deck
Default graphics settings perform well on Steam Deck

PC version details

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows, macOS, Linux
Achievements: 10
Steam features: Cloud saves, Family Sharing, Trading cards
Languages: Text only: English.

Does Sickness use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam