Ayumi Hamasaki (浜崎あゆみ) is most popular jpop music stuperstart in Japan. Fans calling her “Ayu” . Many fans love her, because she create amazinh lyrics. (More information there)
Official Website: http://www.avexnet.or.jp/ayu/
She’s one of favorite female artist and her lyrics of songs are amazing.I really recommend you to listen her music, her video clips are fastastic too (Youtube:Ayu).