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The second child from The Other Minami Family.
Touma's older brother and Haruka's underclassman. In junior high school, he is the second banchou. He was a former delinquent before Hosaka's invitation of him to the volleyball club mellowed him out. Natsuki regularly cooks for the other Minami family and shows frequent signs of embarassment and indirect affection when he sees or hears about Haruka.