He is the son of Kajiya, a swordsmith, and Yoshino, a descendant of Queen Fuse. He was born with the jewel, which had been given to Yoshino in a dream. His mother died while returning from a pilgrimage and after helping an old professor. His father was killed by Kai's men. He seems to always regret possessing the jewel within his Masamune, a weapon he had no idea how to use, yet he always seems to know exactly what to do when it takes over, feeling that it was responsible for his parents' deaths.
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