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Chisato Sumiyoshi (住吉 千里)Height: 158 cm
Weight: 45 kg
Yuuki's childhood friend and the founder of the Food Research Club. She has an impressive record of being in the same class as Yuuki since grade school. Due to an unknown incident, Chisato hates chocolate. Chisato is shown as a tsundere who harbors feelings for Yuuki since the beginning of the story.