The Dark Hour is a hidden period of time that begins and ends at midnight. During the Dark hour, the entire world changes in a variety of ways:
- The moon swells up to about double its size and more luminous.
- Light becomes sickly green or greenish yellow.
- Puddles of what appears to be blood form on random surfaces.
- Electronics stop working normally.
- People unaffected by the Dark Hour turn into coffin-shaped crystalline structures.
- Shadows become active.
- Some areas of space warp.
Persona users are unaffected by the Dark Hour, allowing them to hunt Shadows.