Professor Yumi Kōda is a senior professor and the supervising instructor at the art institute where Hagumi Hanamoto studies. Her background as an artist is marked by a determined but ultimately unsuccessful struggle to achieve recognition as a painter in Paris. This personal history informs her role within the story, where she functions as a figure of authority and experience within the academic setting, overseeing the progress of students like Hagumi. Her motivations stem from her own artistic ambitions, which, despite falling short of her goals, allow her to offer a grounded perspective on the challenges of pursuing a career in art. Her interactions with the main characters are limited but serve to highlight the institutional and professional realities of the art world that the younger students must navigate. Further details about her personality, specific relationships, or character development are not available in the sources.