Seiji Higaki’s Father
Although he is a human, he thinks of himself as a sword, such as he thinks that there is no meaning to a sword that does not cut, due to his logic, as a sword, he does not need emotions or to think, or to feel anything.
Mutsue is a tall, muscular man with wild aggressive appearance, which might not fits his personality.
Mutsue trained Seiji without mercy or pity even threatening to kill him if he failed. To Seiji his father was the embodiment of fear. However not even Seiji’s father could overcome aging. One day he fought another warrior and lost ending up severely injured