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.

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?

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.

Despite identifying the Gnosia and surviving, Yuri finds themself back at the first day in a daze; a person with an unusual presence, Yuriko, appears before them.

Gnosia is an enemy that disguises itself as a human and attacks them; it is now on the spaceship, causing everyone onboard to be suspicious of each other.

Gnosia is an enemy that disguises itself as a human and attacks them; it is now on the spaceship, causing everyone onboard to be suspicious of each other.