D is a prominent visual kei metal and rock ensemble established in 2003 by vocalist Asagi and guitarist Ruiza, emerging after the dissolution of their former band Syndrome. Their diverse musical repertoire features powerful guitar-driven anthems, poignant ballads, and intricate compositions that draw inspiration from medieval and folk traditions. The lyrical content frequently delves into profound themes of love, human nature, and spirituality, all beautifully accentuated by their elaborate, thematic costumes that enhance their artistic identity.