Check for characters missing birthday info here.
January
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Kaori Natsuki
February
-
Takahisa Tajima
-
Takahisa Tajima
March
-
Yukiko Hirohara
April
-
Saiko Akamine
June
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Yuka Minase
-
Yuka Minase
July
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Kakeru Satsuki
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Kakeru Satsuki
September
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Kukuri Tachibana
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Misuzu Kusakabe
October
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Tadashi Teruya
-
Shiori Momono
November
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Mio Kouno
December
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Ema Tajima