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It is a secret technique of Tenshinryu. Tessa (手鎖/鉄鎖) is generally called Fundojyutsu（分銅術）. Tessa is the basis of Kusarigama（鎖鎌）. When traveling, Shirindan（士林団） hung Tessa around her neck and carried it. They used a hook on one side of Tessa and attached it to the sword Tsukagashira（柄頭）. Prepare in advance and use it as a fighter during battle. It was particularly effective in the dark. This is especially useful when using a Kodachi（小太刀）. You defend your enemy's attack with a hidden chain, remove it, and add counterattacks at the same time.
