Tourbillon (トゥールビヨン) is a Japanese rock band comprised of LUNA SEA members Ryuichi Kawamura (河村隆一) on vocals and INORAN on guitar, they were joined by composer/music producer H. Hayama (葉山拓亮) from D-LOOP on keyboard. In 2008 they reached top 3 on the Oricon Weekly Ranking Charts with Break the Chain, a first for the band since its formation in 2005.