The Japanese national anthem was officially adopted in 1999, but it hasn't had quite the appeal of other national anthems throughout the world. A friend of mine sent me a link to a fascinating article that may be of interest to you. It's called Something to Sing About - Japan needs an anthem that unites the nation. I highly recommend reading it. Post your comments if you want to have a discussion about it.
Below is some information not contained in the article. First is the lyrics of the song, second is the melody.