Yet this rip-roaring, heartbreaking YA adventure is very much its own beast, as different from Miyazaki’s ageless Studio Ghibli animations as it is from live-action western romps such as Freaky Friday, The Hot Chick and It’s a Boy Girl Thing or, perhaps more pertinently, from Nobuhiko Ôbayashi’s 1982 Japanese hit, Tenk?sei.