Gnosia

Yuuri, with no memory of who they are, finds themselves on an interstellar cruiser with four other crew members. The crew has a problem: one of them is a Gnosia, a human infected with a Gnos virus that aims to wipe out humanity. To stop the Gnosia, the crew must vote on who they think is the infector, and the suspected Gnosia will be put into cold sleep. However, the crew's voting strategy is unreliable, and Yuuri is eventually left alone with the Gnosia.