Japanese song writer "Sai" is Unusual career. He is a ex-menber of J-Rock,Punk artist Sambo master(before the debuts) and a first graduate of Avex artist academy Creator course. Sai wrote songs J-pop artist 9Nine(Sister group of Japnese famouse artist"perfume"),K-pop artist John hoon etc... You can feel Genreless,Borderless and say "What is Sai?" by this album.