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), 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.[1]