Check for characters missing birthday info here.
January
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Yukariko Sanada
February
-
Fumi Himeno
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Mashiro Kazahana
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Sakuya Amakawa
March
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Yukino Kikukawa
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Aoi Senou
April
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Alyssa Searrs
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Alyssa Searrs
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Midori Sugiura
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Reito Kanzaki
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Youko Sagisawa
May
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Nagi Homura
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Akira Okuzaki
June
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Nao Yuuki
July
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Miyu Greer
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Miyu Glear
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Mai Tokiha
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Mai Tokiha
August
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Haruka Suzushiro
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Natsuki Kuga
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Natsuki Kuga
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Takumi Tokiha
September
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Akane Higurashi
October
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Mikoto Minagi
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Shiho Munakata
November
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Mikoto Minagi
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Yuuichi Tate
December
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Chie Harada
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Shizuru Fujino