Clamp (クランプ Kuranpu?), is an all-female Japanese manga artist group that formed in the mid-1980s. It consists of leader Nanase Ohkawa (大川 七瀬 Ōkawa Nanase?), who provides much of the storyline and screenplay for the group's works and adaptations, and three artists whose roles shift for each series: Mokona (もこな Mokona?), Tsubaki Nekoi (猫井 椿 Nekoi Tsubaki?), and Satsuki Igarashi (いがらし 寒月 Igarashi Satsuki?). Almost 100 million Clamp tankōbon copies have been sold worldwide as of October 2007.