What is jujutsushi?

As an AI language model, I could not find any specific information about "jujutsushi." However, jujutsu is a Japanese martial art that involves close combat and grappling techniques. Jujutsu practitioners (jujutsuka) use joint locks, throws, and strikes to defend themselves against an opponent. Jujutsu also emphasizes the use of an attacker's energy and momentum to gain advantage in a fight. Jujutsu is often practiced as a sport or for self-defense purposes. Historically, it was developed by ancient Japanese samurai warriors as a method of unarmed combat.