Check for characters missing birthday info here.
February
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Tamaki Kotatsu
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Wendy Marvell
March
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Sumi Sakurasawa
April
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Hina Tachibana
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Iris
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Saki Saki
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Chizuru Mizuhara
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Asuna Kagurazaka
May
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Ichika Nakano
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Itsuki Nakano
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Miku Nakano
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Nino Nakano
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Yotsuba Nakano
June
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Kazuya Kinoshita
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Elizabeth Liones
July
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Juliet Persia
August
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Ruka Sarashina
September
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Rui Tachibana
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Maki Oze
November
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Mami Nanami
December
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Merlin
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Diane
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Urara Shiraishi