Kusanagi Naoya

Naoya is the main protagonist of the story. He moved into the Natsume household after his father died. He cooks for the Natsume family since neither Ai, Kei, nor Shizuku can cook decent meals.

From Wikipedia

After graduating from Yumihari Gakuen, he went on to a national art university and worked as a part-time lecturer at Yumihari Gakuen. In this work, he becomes a full-time employee and becomes an art teacher. Together with the students, he revives the prestigious Yumihari Gakuen Art Club