The Notion is a group created by Pure Cascara in the aftermath of the Miracle of the Mirage in order to try to create structure in the Quire System. Members of the Notion include all player characters: Echo Reverie, Signet, Tender Sky, Fourteen Fifteen, Even Gardner, Gig Kep-hart, and Grand Magnificent.
They travel together on Fourteen Fifteen's fishing spaceship The World Without End, and split up into different subgroups to perform missions.