Natsuo Kōsaka is a supporting character in the anime My Girlfriend is Shobitch. He is the husband of Fuyumi Kōsaka and the father of Akiho Kōsaka, the main heroine. Natsuo works as an ordinary office worker and is described as a gentle, warm, and caring man who deeply loves his family. In both personality and appearance, he shares many similarities with Haruka Shinozaki, the male protagonist. Like Haruka, Natsuo often finds himself taken by surprise by the peculiarities of his wife's direct and uninhibited approach to matters of intimacy and education. Despite the years they have spent together, his wife's straightforwardness and unconventional methods continue to bewilder him. However, he maintains a strong and happy marriage with Fuyumi and wholeheartedly supports his daughter. His role in the story is primarily that of a concerned but loving father who, despite his confusion, provides a stable and caring home environment. No notable character development or special abilities are documented for him.