Yuko Sakaki is one of the class of third-year students at the fictional Shiroiwa Junior High School in the fictional town of Shiroiwa, Kagawa Prefecture.
In the novel, as a child, Yuko’s alcoholic father used to abuse her, her mother, and her older brother. Her father was stabbed and killed by local Yakuza over a gambling dispute when Yuko was in the first grade. She still had nightmares about him, and had since become terrified of any violent or gory situation.

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