Natsuki Minami (南 ナツキ, Minami Natsuki)
Voiced by: Hiroyuki Yoshino
Second son of the other Minami family, and is in first year of high school. He used to be a delinquent, but had calmed down after Hosaka recruited him to the volleyball club. He got beaten up by Haruka the first time they met due to a misunderstanding, with him touching her chest (in the manga, he accidentally hugs her instead). Despite this, he harbors no ill feelings towards her and instead shows signs of embarrassment and indirect affection towards her, this is made evident when the eldest Minami brother talks about having a girlfriend and Natsuki immediately pictures a provocatively dressed Haruka in his mind and suffers a nose-bleed. "Natsu" in his name probably refers to "summer."
Hitomi developes a crush on him.