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This is based on my favourite old anime, that's been running since the 1960's. The stories are jam-packed with Japanese monsters, ghosts, and goblins both old and new.
Basically, Kitaro (also spelt Kitarou) has returned from the dead (along with his father) as a powerful ghost in the form of a young man, and uses his powers to keep the peace between the human and the spirit worlds.
When a multiple haunting strikes an apartment block, Kitaro investigates and meets teenage Mika and her little brother. Their father has accidentally found a magic stone that could give a gang of shape-shifting foxes unlimited power. Can Kitaro save their father from the greedy foxes, without upsetting the higher echelons of the yokai hierarchy?
There's some exposition for newcomers, but the bizarrest creatures may still confuse... his dad is a huge eyeball with a tiny body, there's a man running around with nine foxtails, a lardy blubber monster, a gigantic straw sandal demon... but really all creatures that are only scary for 5 year olds.
The film is very faithful to the manga and anime stories, except for Kitaro himself. He's now both grey-haired and teenaged (instead of brown-haired and ten years old). I suppose grey hair suits his being 350 years old, but doesn’t remind you at all of his usual appearance. You can also glimpse the actor’s left-eye behind his hair in several scenes - it's supposed to be an empty eye socket.
Pop star Eiji Wentz doesn’t act like Kitaro normally does, far less confidently and brave than his cartoon counterpart. It’s a tough role to fill, but the rest of the cast seem to be more lively. Besides being made old enough to be caught in a love triangle (between Mika and his friend Cat-Girl), he's now a slacker who has to be thrown out of bed in the morning.