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Yuu Kashiwagi (栢木 優雨)Birthday: 6 November
Blood Type: O
Height: 142 cm
Yuu is a new student in the school. Her onee-sama is Hatsune in the dormitory building. She has a weak constitution. She strives for rehabilitation while she develops rapport with Hatsune and Chihaya, and she gets better little by little. She calls Chihaya Tenshi-sama (Angel).