Check for characters missing birthday info here.
January
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Aoi Saitou
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Mamiko Oumae
February
-
Hazuki Katou
April
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Yuuko Yoshikawa
-
Riko Nakase
May
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Reina Kousaka
-
Takuya Gotou
June
-
Natsuki Nakagawa
July
-
Mizore Yoroizuka
August
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Kumiko Oumae
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Noboru Taki
September
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Kaori Nakaseko
-
Shuuichi Tsukamoto
October
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Haruka Ogasawara
-
Michie Matsumoto
November
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Sapphire Kawashima
December
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Asuka Tanaka