Natsuo went to the same high school as Kannosuke, Hiromu and Fuyuji, and used to bully Hiromu into being his gofer. Years later, he goes to the salon Hiromu works at, and becomes interested in him without realizing who he is. Claiming that he had fallen in love at first sight, Natsuo asks Hiromu out; despite his assertiveness, he has never actually kissed or dated anyone properly.

Natsuo works in construction, is a terrible cook (he only started cooking after getting with Hiromu), and has no fashion sense. He has four siblings, and all of them have the same menacing look.