Nanohana, Sai

Sai is Jiyu's father and a ghostwriter for silly samurai dramas. He is often tormented by memories of his wife, who died at home by Jiyu's side while he was working in his office. After the incident, he promised to be a better father to Jiyu and subsequently began working from home. Despite his appearance, Sai is actually talented; he taught Jubei the "Yagyu Shinkageryu Mutodori".
(Wikipedia)