In life, he was Yone—half-brother of Yasuo, and a renowned student of his village's sword school. But upon his death at the hands of his brother, he found himself hunted by a malevolent entity of the spirit realm and was forced to slay it with its own sword. Now, cursed to wear its demonic mask upon his face, Yone tirelessly hunts all such creatures to understand what he has become. Yone used to be a fairly loyal and honorable man who always put his responsibilities before his feelings, he cared a lot about his half-brother Yasuo, the two were very close and studied ninja techniques together, however, Yasuo being born with magic was much more skillful than him with ninja techniques which made him feel some envy. When he discovered Yasuo's "betrayal", Yone was emotionally devastated, but continued with his duty which was to kill his brother. The two fought a duel to the death and Yasuo with tears in his eyes, won by killing Yone, he reached the afterlife, and there he discovered what had really happened and that his brother was not to blame. When he returned from the dead, Yone dedicated himself to understanding what he had become, he also forgave his brother for killing him and asks him to move on with his life. according to several rumors they say that he has a great friendship and much affection for the fawn Lillia with whom he became friends.