The single father of Tsumugi. His wife died of unknown illness and he is currently doing his best to take care of his daughter. He is a math teacher at Kotori's school. He currently works hard with Kotori to become a good cook to make his daughter happy. The three often hang out at Kotori's place and eat meals together. He is a bit plain and wears glasses, but is a very kind hearted and hard working person whose daughter is his life.