Zenzo Saeki

Koshiro and Nanokas father. While he was married to Makie he had an affair it is implied that this was the cause of their divorce. A man in late middle age he is prone to bouts of hysterical worry and is somewhat clueless. Still he cares for his children although he clearly favors Nanoka and does his best to make Nanoka feel at home in her new surroundings. He is an architect.