Your blog is operating properly http://ismyblogworking.com/fukuokabc.org
re: Google and other search engines
It takes weeks for search engines to index content in a new blog. It takes weeks or even months depending one how much content there is for search engines to re-index content under a new URL when a URL is changed. When you change a blog visibility from public to private and back again it takes even longer to get your content indexed.
What attracts search engines is unique content the cannot in posts that cannot be found anywhere else on the internet. Start now publishing original content posts frequently two or even three times weekly. For more information read > http://onecoolsitebloggingtips.com/2010/01/21/omg-i-cant-find-my-blog-on-google/
The process we use for verifying free hosted WordPress.com blogs with search engines is found here > http://en.support.wordpress.com/webmaster-tools/
Note: Even if you do not verify the blog the content will be indexed by search engines so don't feel panicky about this please.
WordPress.com provides the search engines with site maps. We bloggers do nothing. http://en.support.wordpress.com/sitemaps/
Lastly note that we cannot assist with search engine issues. They are between the blogger and the search engine. http://en.support.wordpress.com/search-engines/