The film follows a young boy's search for the mythical island of fireflies described in his mother's bedtime stories. Using the "clues" he believes his mother left behind in an old notebook, the boy makes the long journey to the magical island to wish her back to life.
A series of vignettes include: a neglected and gadget addicted 6 year old who befriends a malevolent entity from a defunct children’s show, causing deadly events at home; a group of influencers gathering for a collab in a luxurious mansion; and a bunch of thrill-seekers who go on a trip to watch a meteor shower.