Free Collars Kingdom (フリーカラーズキングダム, Furī Karāzu Kingudamu) is a Japanese manga series written and illustrated by Fujima Takuya. The individual chapters were serialized in Magazine Z, and compiled into three tankōbon volumes released by Kodansha from February 2003 to March 2004. Set in Ikebukuro, Japan, the series revolves around the struggle of two stray cat groups. Cyan, a young newly abandoned cat, joins one of them, the Free Collars.