 The are Arthropod-like alien lifeforms that came from a meteor that devastated the city district of Shibuya seven years prior to the series' current timeline, the meteor being part of a larger one that greatly devastated Earth in the previous timeline depicted in the film "Godspeed Love".The Worms are motivated to subvert and replace the population of an area they invade, possessing the ability to replicate the appearance and memories of another being whom they kill off.Worms believe that the original will live on as a part of them, since they adopt their victim's personality traits.