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Box Office: Hayao Miyazaki’s ‘The Boy and the Heron’ Opens Strong in Japan (Despite No Marketing)
(www.hollywoodreporter.com)
lol, no marketing.
It's been announced as a Miyazaki film, which alone will get it a huge audience.
There have been various articles about how Miyazaki has said this will be his last (not the first time, but it could still encourage moviegoers) and about how they're being secretive on the details of the movie (people love mystery).
This movie had fantastic marketing.