Come, let's seize the world!
This sword's history is very different from the others.
Rather than being known for who or what he killed, Mutsu is known as the sword who "didn't cut anything." The one who loved him and made him famous was "Sakamoto Ryouma."
Sakamoto was a master of Hokushin Itto-ryu. However, there are no stories or records of Sakamoto killing someone with a blade. When he was attacked in the Teradaya Incident, he didn't draw his blade, instead, using his gun. Even when he was killed in the Omiya Incident, though he tried to draw his sword from its sheath, he didn't cut anyone. But since he was reaching for Mutsunokami Yoshiyuki to the very end, even if he didn't kill anyone, Sakamoto probably felt protected by this sword.