Mitsuru Natsui ( 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.
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