This compilation is made to commemorate the 50th birthday of hide includes his last unreleased song, "Co Gal," which had existed only as a demo audio with roughly recorded vocal. This time, the song is resurrected featuring a vocaloid replicating the voice of hide produced by I.N.A. Also includes 15 leading songs. Features remastering and SHM-CD format. This edition includes a demo version of "Co Gal" and a bonus DVD with music video(s) and rare performance(s). Package featuring color photo of hide. *The DVD disc is encoded for region 2 (Japan, Europe, and Middle East), and no subtitles are included.