D is a Japanese Visual Kei band formed in March 2003, by vocalist Asagi, guitarist Ruiza, drummer Hiroki, original bassist Rena, and other original guitarist, Sin. Shortly after the release of their first EP "New Blood" on July 18, Ruiza was hospitalized for an unknown illness, and Sin left D. During this time period, Asagi and Hiroki continued to play shows under the name "Night of the Children", with a support guitarist named Hide-Zou. On September 27, Ruiza was released from the hospital, and D continued with Hide-Zou replacing Sin as the other guitarist. Their bassist Rena left on July 27, 2005, and was replaced by Tsunehito on December 5 of the same year. This made D's lineup as Asagi (vocals), Ruiza and Hide-Zou (guitars), Hiroki (drums), and Tsunehito (bass). This has been their lineup ever since.
D's musical style consists of mostly heavy metal and rock.