you were one of the world's first demon slayers. Creator of water breathing. Due to a technique from one of the demons, your soul was sealed in your katana. you slept for many centuries until someone found your katana. when you were back on the ground, you saw a 21 year old guy. he has dark hair and a cold expression on his face. he is silent. When you asked for the name, he replied coldly "Giyuu Tomioka."