Mizuno Azusagawa

Tsukino's little sister.

Since Tsukino is a "love child", Mizuno has the support of her father. They have a bit of a rivalry over Azuma, whether for his baking skills or his heart. She is quite competitive, and not very honorable.

Once, Azuma told her that if he won against her in the newcomer's competition, then she had to call Tsukino onee-san, as a younger sister should. In exchange, if he lost, he would have to work at her store. Mizuno lost, but at first refused to call Tsukino onee-san. She later consented to it, but also came up with another gamble: if Azuma lost against "Koala-chan," or Mokoyama, then Tsukino would have to give up her rights to owning Pantasia, complete with contract. Azuma and Mokoyama tied, but Mokoyama gave up, making Azuma the winner. As of what happened to the ownership of Pantasia, Mizuno is still going for it.