When a shapeshifting enemy known as Gnosia infiltrates a lone spaceship, the crew has only one way to survive: identify the imposter each day and put them into cryo-sleep. But for Yuri, the day never ends. Trapped in a time loop, she relives the first day of the crisis over and over. To escape, Yuri must uncover the truth behind Gnosia and the time loop itself—before it's too late.
E1
Yuri, who has lost their memory, wakes up aboard the Interstellar Cruiser D.Q.O. They are taken by Setsu to participate in a meeting to identify the "Gnosia," a being that attacks and annihilates humans.
E2
Yuri, who looped back to the first day, attends the meeting knowing who the Gnosia is. Yuri tries to cast suspicion on SQ, but the discussion doesn't progress as expected...?
E3
Shigemichi and Stella join the group, and a meeting is held with seven people. During the meeting, Yuri uses their intuition to identify the Gnosia, but they struggle to convince the other crew members.
E4
Despite identifying the Gnosia and surviving, Yuri finds themself back at the first day in a daze, when a person with an unusual presence, Yuriko, appears before them. She seems to know something, but...?
E5
New crew members Comet and Chipie join the meeting. Two of the crew claim to be engineers, but Racio argues against voting for them, resulting in the votes going to...?
E6
Yuri attends the meeting in a new role as the "Guardian Angel." With Jonas and Kukrushka joining, the meeting now has 13 people, and as the situation becomes chaotic, one crew member raises their hand.
E7
Otome and Remnan join the crew and try to start the meeting, but another crew member, Sha-ming, won't come out of his room. Meanwhile, Shigemichi begins to talk about his feelings for Stella.
E8
E9
Yuri awakens as a Gnosia. While feeling conflicted about deceiving the crew, they remember Comet, who is in the same position. This inspires Yuri to fulfill their role as promised to Setsu.
E10
Yuri loops again and is surprised by their new appearance. Meanwhile, the meeting is postponed due to Sha-ming's absence. Racio speaks to a now-bewildered Yuri about the secret of the silver key.
E11
E12
Jina extremely dislikes lying and deceiving others. When Yuri confides in her about the loop, she recalls painful memories and expresses her fear and resistance to becoming a Gnosia.
E13
Setsu loses consciousness before the meeting and is taken to the infirmary. While sharing the information they had gathered, Yuri suggests a change of pace to Setsu, who is showing signs of fatigue from hundreds of loops.
E14
Yuriko tells Yuri, "If you survive this loop, I will tell you everything." They attend a meeting with all 15 crew members. However, once the meeting begins, Yuriko makes an unexpected proposal.
E15
Yuri, an "Engineer" in this loop, identifies Racio as a Gnosia. Racio claims innocence based on a certain action. With the appearance of the "AC Follower," the meeting descends into confusion, putting Yuri in a corner.
E16
Yuri wakes up in a world line where the ship has escaped the Gnosia contamination. Yuri is confused when Kukrushka indicates that it's the "end of the universe." Then an alarm sounds, warning the detection of an anomalous lifeform.
E17
Yuri learns the truth: that they are a "bug" that shouldn't exist. They struggle to escape the time loop and the cosmic collapse caused by their dual existence, but...?
E18
E19
Yuri manages to escape the time loop, but the crew members have lost all memory of Setsu. They search for traces of Setsu on the planet where they land, but are confronted with the fact that Setsu's very existence has vanished.