Kusarigama

, meaning "chain-sickle", is a traditional Japanese weapon that consists of a kama (the Japanese equivalent of a sickle) on a metal chain (kusari) with a heavy iron weight (fundo) at the end. The kusarigama is said to have developed during the Muromachi period. The art of handling the kusarigama is called kusarigamajutsu. The weapon is used by Yōkai Taijiya like Kohaku.

Coincidentally the Kusarigama was a popular ninja weapon, which is what Bankotsu often called Kohaku, much to his annoyance.