Masa is the stage name of a Japanese musician. While he is not so prominent in the Japanese music scene, he was member of GacktJOB, Gackt's band. He has also been in the disbanded "Spiky" and is currently the vocalist of "Dizzy Drive". Masa is a favourite among fans as he is very sweet-looking and cute. Wikipedia
The definitive Wikipedia entry for Masa. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Masa_%28musician%29