 If you liked
Howl no Ugoku Shiro
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 ...then you might like
Mahou Shoujo-tai Arusu
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Both animes reminds me of each other as they have magic, witches and wizards.
The plot may be diffrent but I think both directors want to tell you the same
meanings. There is also more similarity which you can find for yourself while watching.
It is worth to watch them both as they have very unique world settings and great characters.