The phrase comes from Death Note, the anime about Light Yagami, a student who uses a supernatural notebook to reshape the world through elaborate schemes. In fansubbed episodes, a translator's note explained that the Japanese word keikaku means plan, and viewers began quoting the line as 'all according to keikaku' whenever Light's plotting paid off. It spread through anime forums, image boards and YouTube edits as a shorthand for a villainous master plan, and it endures because it instantly frames any success, real or staged, as the result of genius foresight rather than luck.