Check for characters missing birthday info here.
January
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Mimori Kishida
-
Minami Takahashi
-
Nagisa Motomiya
February
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Haruna Kojima
-
Yuki Kashiwagi
March
-
Mayu Watanabe
April
-
Yuka Ichijou
June
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Tomomi Itano
-
Makoto Yokomizo
July
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Sonata Shinonome
August
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Suzuko Kanzaki
-
Sayaka Akimoto
September
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Orine Aida
October
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Kanata Shinonome
December
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Chieri Sono
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Yuuko Ooshima
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Sae Miyazawa