Assassin's blade
The Monohoshi Zao (物干し竿?, The Laundry-Drying Pole), also known as the “Bizen Osahune Nagamitsu”, is an over five shaku long, 150 centimeter, Bitchu Aoe (備中青江, Bichū Aoe?, Blue River of Bitchu) blade wielded by Sasaki Kojiro. The Bitchu Aoe may have been the master's, or perhaps Kojiro received it from the Holy Grail when the legendary soul was summoned. It is simply something thought to be part of who he is. The length defies common sense, the name being a derogatory nickname rather than a formal title, meaning “That blade is way too damn long to use!” It cannot be called "useful" despite its large range, as almost nobody except Kojiro, having a mastery of the sword exceeding the realm of humans, could even wield it. The katana is a longsword not suited to direct competitions of power. It will break fighting off a sword like Excalibur, so he cannot lock blades or compete in strength. He can only parry blows and push the opponent back by attacking their body because the blade is meant to cut with speed and technique unlike western swords that cut with weight and power, making fighting styles between the two mismatched.