As a childhood friend and founder of the Food Research Club, Chisato has been in the same class with Yuuko since grade school. Despite an unexplained reason, she detests chocolate. Throughout the series, Chisato is portrayed as a tsundere who harbors feelings for Yuuki from the start of the story.
Her brother died when Chisato and Yuuki were kids, which also made her hate chocolate. It is also revealed that she used him as an emotional support f