Unmasked

"Unlock memories !"
A group of five people wake up in a devastated world, masks firmly attached to their faces by unbreakable locks. The moor is covered in fog and the few buildings still standing seem to have suffered a... cataclysm. When a first monster appears in this foggy world, they understand that they must kill it to break the locks of their memories...

Original Webtoon

Official Translations:
English