In 2097, time collapsed.
A quantum experiment pierces the stability of the timeline, and "time devourers" leak out of the cracks. The infected lose consciousness and become "retrospectives" - they are not zombies, but immune cells of time itself, instinctively hunting down those "anchors" that may change history. Human civilization collapsed within three months. The survivors hid in the deep sea and lingered in the darkness. They thought it was the end.
Little do they know, this is just the beginning of their choices.