The first release was March 10, 2006. An electro and nostalgic song including "Storms ~Arashi~" written by Oji Hiroi, and the title song "Sphere", all arranged by Keiichi Sugiyama, who has worked on many game music such as "Hatsune Miku -Project DIVA-" and "Rez". , Sonozaki Mie's debut mini-album.