Shigeaki Miyazaki, known professionally as Aska, is a Japanese singer-songwriter. He is best known for work as part of the music duo Chage and Aska. As a composer, he wrote most of the duo's hit songs, including "Morning Moon", "Love Song", "Say Yes", and "Meguriai". He has also written for many other singers and groups, including Hikaru Genji. He was formerly known as Ryo Aska or Ryō Asuka.