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...?

Before escaping from Liu-An-- Yuri wakes up on "DAY 0," the day before the day that always loops. The Setsu they encounter there seems unaware of the silver key or the time loops...?

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.