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From the start, it’s obvious that this is not a regular Kaiju movie. The genre, in which gigantic beasts à la Godzilla lay waste to cities and swaths of countryside, is not known for restraint, but “Shin Ultraman” is completely, unpredictably off the wall.

Captain Tamura (Hidetoshi Nishijima, from the radically different “Drive My Car”) leads a task force dedicated to fighting the big monsters that turn up with clockwork regularity. “For some reason, Kaiju only appear in Japan,” someone quips about the creatures’s absence elsewhere in the world. But even this elite squad is flabbergasted when a mysterious helmeted giant clad in a superhero-like red and silver bodysuit shows up. Called Ultraman (a popular character who has been the subject of many iterations since its introduction in 1966), the newcomer helps the overwhelmed team battle aliens like Mefilas (Koji Yamamoto).

Both a reboot and a riff, “Shin…