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Aleister's Plan (アレイスターの計画プラン Areisutā no Keikaku (Puran)?), or just the Plan (計画プラン Keikaku (Puran)?), refers to the overall master plan of Aleister Crowley, founder and Board Chairman of Academy City as well as the greatest magician of the 20th century, which guides his actions and the events of the Toaru series.
Shrouded in mystery for most of the series, the exact nature and goals of Aleister's plan have long been a matter of speculation, both in-universe and out, with details gradually being uncovered and the overall plan only fully revealed in the later stages of Shinyaku Toaru Majutsu no Index.