Mitsuru Natsui

Mitsuru Natsui (夏井満 Natsui Mitsuru?) is Azuki's hard-working brother. In the manga, he works at a confectionery company, developing candy. When they were younger, Azuki and Mitsuru's father died and Mitsuru promised to become a candy-maker and be Azuki's male role-model. He greatly dislikes Shinjyurou as a result of his protectiveness towards Azuki. (Source: Wikipedia)