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.

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...?