Yuuichi Kirasaki is the owner of St. Pierre, a bakery where he dreamt of making a bread that will represent Japan.
Azuma's main antagonist (later decoy antagonist), the owner of St. Pierre, and ironically, the same 'kind old man' who encouraged Azuma and started his baking career in the very first chapter/episode. He is in league with Yukino, who, in her struggle to dominate her sisters for control of Pantasia, betrays the store and allows Kirisaki to buy it out. The reason for Pantasia's involvement in the Monaco Cup is so that Kanmuri can organize the ten billion yen required to protect the company, but in the end, the plot fails. Kirisaki allows the team a final chance in the Yakitate!! 25 (manga) /Yakitate!! 9 (anime) competition to win back Pantasia, but his ulterior motives for this are not yet clear. Yuuichi's brilliant and estranged son Meister Silvan Kirisaki is the general manager of Pantasia, and his daughter Sophie Balzac Kirisaki assists Azuma's team during the Monaco Cup. Specialized in Gopan (Bread with rice or rice-based material in it), his baking ability is said to be strongest, as his bread can send even unsensitive people into a strong reaction state where they feel that they are in the universe, and even Shadow can only copy him 98% on the first try. Ironically, Gopan is part of his dream to create a bread that can represent Japan, something Azuma's Japan is attempting to do.
At the beginning, the nature of his evil is left ambiguous, since it is implied that he only acts evil in order to push Azuma to improve his skills, and was never revealed in the Anime; in the anime, when he eats Kazuma's bread in the final round of Yakitate!! 9, he experiences a change of heart and explains to Pierrot why he has been so cruel to Kazuma, but when the effect of Kazuma's bread wears off, his original attitude returns and he continues to challenge Azuma. In the manga, it was revealed that his evilness was part of a reaction of his first Gopan, known as "Devil's Gopan", which is so addictive that, aside from violent withdrawal symptoms, can also transform a kind person into an evil person and vice versa; eventually, he was actually possessed by the Demon King of Bread, and transformed into a hybrid of bread and human known as Hu-Pan. After eating Azuma's ultimate Japan, he was reverted back to his old self and separate from the evil Hu-Pan king. Before the Demon King dies after his defeat by an ultimate Japan-empowered-Kawachi, he made his last-ditch to kill Azuma through shooting with a turtle bread, but Yuuichi sacrifices his life to save the boy. Thankfully, the result of eating Azuma’s ultimate Japan grants Yuuichi’s body to become part of Hokkaido, such as forming a Dasetsuzan Mountain look like, saving his life, but only unconscious for few minutes for his recovery. At the end of the series, Yuuichi now recovered, entrust St. Pierre’s main branch to his son Silvan, while also planning to open his shop’s French branch with his daughter Sophie, who is now as his general manager.