These fonts are very useful for viewing Japanese text. They were designed by Ricoh and are owned by Microsoft. Although they are freely available on the internet, they are not freeware. They are governed by Microsoft licenses, but you are able to download and use them for free. The files come from www.themeworld.com.
This is a sans serif font. It has both nice looking Western and Japanese faces. MS Gothic
This is a serif font. It too has both nice looking Western and Japanese faces. MS Mincho