Zen Makunouchi is an impatient chef-in-training from Yokohoma. He is the son of the world renowned master chef: Tsukiji Makunouchi, he is also the brother of Karin. He trains under the former King of all food: Haoji in order to become a master chef like Tsukiji.

An 11-year old boy named Zen bands together with his younger sister, Karen, and a young boy who has a large appetite, Pitan, to battle an evil empire by using their "Foodons"; strange monsters that are created from various foods.
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(Source: Anime News Network)