Koyori is Mana's younger sister. At the start of the story, she is hospitalized alongside Aono, though she is discharged shortly thereafter. If Koyori addresses Mana by her first name rather than as her older sister, Mana hits her on the head. Koyori makes an effort to keep Aono company whenever possible, and the two develop a close friendship during Koyori's stay. Aono also shows her how to fold origami. Koyori remains very polite to others, even when it is not expected of her.
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