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Haruka Saigusa (三枝 葉留佳)Height: 163 cm
Weight: 49 kg
Birthday: 13 October
Haruka is a schoolmate of Riki's from a different class, but despite this, always seems to find time to hang around in Riki's classroom. She is a problem child and will start an uproar for her own personal enjoyment, which causes the public morals chairman Kanata Futaki, to often chase after her.