Gnosia is a 2019 visual novel and social deduction game developed by Petit Depotto. It was first released for the PlayStation Vita in June 2019, and later reached the Nintendo Switch, Windows, PlayStation 4, PlayStation 5, Xbox One and Xbox Series X/S. Set on a spaceship, it combines role-based deduction with a time loop, in which the player tries to identify infected crew members while uncovering the cause of the loop. An anime television adaptation produced by Domerica aired from October 2025 to March 2026.
Gameplay
The game mixes visual novel role-playing with randomized social deduction. The player and non-player characters aboard a spaceship must identify which crew members are Gnosia, alien-like creatures that kill humans. Each time loop changes the number of Gnosia and characters, as well as the player's own role, which can be human or Gnosia. Several special roles, such as the Doctor, the Engineer and the Guardian Angel, provide different ways to investigate or protect others. Repeated loops reveal events that add backstory to the characters and setting.
Plot and themes
The story takes place in the far future, when humanity has spread across space and faces the Gnosia, an infestation that drives people to kill in the name of their god. The player is trapped in a loop on a refugee ship, and must work with a passenger named Setsu to escape. Their investigation reveals a hivemind of cyberised humans and an entity called the Silver Key, which causes the loops and gathers data from them. The game has a true ending that depends on the player's choices across many loops.