らせん (Rasen) is referred to as a 'special-unit' visual-kei band. It is the collaborative side project of vocalists 二人静(Futarishizuka) (of Ｃｒｕｃｉｆｉｘｉｏｎ) and 祈狂-kikyo- (of La'veil Mizeria). Their music is a similar style to both of the founding member's other bands (aggressive punk infused gothic rock, mixed with a more melodic style found in many late 90's visual-ke bands) and features dual vocals. らせん tends to have only sparse periods of activity. Read more on Last.fm