Attack on Titan creator has no intention for sequel anime or manga

Hajime Isayama, the creator of anime series Attack on Titan, has commented that once the finale has been released, he won't be doing a follow-up

Attack on Titan - Wikipedia

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Attack on Titan: Season Two [Blu-ray] : Bryce Papenbrook, Josh Grelle, Trina Nishimura, Ashly Burch, Bryn Apprill, Clifford Chapin, David Matranga, David Wald, Elizabeth Maxwell, J. Michael Tatum, Jason Liebrecht, Jessica

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Since the AOT manga is finished, will Hajime Isayama make a new manga? - Quora

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