JINN (ジン) is a 4-member Japanese band. They are part of Sony Music Entertainment Japan's Palm Beach record label. The members of JINN (ジン) all attended the same high school, and formed the band in Tokyo in the summer of 2003. In March 2004, the band recorded a demo CD, 0~Zero~, with 500 copies selling out quickly. After that in 2005, the band recorded a mini album, Kotosabi no Ki (言錆の樹). In August 2006, the single Raion (雷音) was released, which was featured as the final opening theme to the Blood+ anime series.