Hi, I wrote an article about this topic on my blog,
Myth and Manga. Not sure I can post the whole thing, so I've just posted a teaser below and you can go to my blog for the rest.
Excerpt:
Ok. So you've read a lot of manga and watched a lot of anime. You’re tired of the high school hero boy or girl spiel and you've decided that you want to write your own magical adventure story. You break out your MS Word, you have the characters, the plot, the theme, but what about the setting?