While this is not a bad movie, it definitely does not rank among the best done by Studio Ghibli.
A couple of the characters are not likeable at all, but the movie is not long and has nice drawings.
It's based on a book by Mary Norton. The movie reminded me a lot of a Tinker Bell movie released at more or less the same date, so I wonder if Tinker Bell took some ideas of that book too...
Summary: worth a watch, but start with other Ghibli's movies.
Summary: worth a watch, but start with other Ghibli's movies.