Mikio Sakai

 is a Japanese singer-songwriter. His real name is . He made his debut with the single .
He has composed, written and performed numerous songs for several anime, including "Fantastic Children", "Tsubasa Chronicle", the Gorō Taniguchi-directed Sunrise productions, "Planetes", "s-CRY-ed", "Code Geass", and "Chivalry of a Failed Knight", as well as various other media.