In flashbacks set before the Keyblade War, the Master of Masters instructs Ava to form five new Union leaders. One of the chosen, Strelitzia, secretly follows the player throughout their journey — until an unknown figure ambushes and kills her. After the Keyblade War, the surviving Dandelions shelter in a datascape of Daybreak Town, with only the five Union leaders retaining their memories. They form Union Cross to prevent the past from repeating: Ephemer, Skuld, Ventus, Brain, and Lauriam — Strelitzia's older brother. Lauriam investigates her disappearance while Maleficent, guided by an unknown figure, escapes the datascape through the tower's Ark. Brain later discovers that the datascape has been trapped by a forced connection to an outside simulation — and that Ventus was never meant to be a Union leader, suggesting he was manipulated into replacing Strelitzia.