Check for characters missing birthday info here.
January
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Daiki Yura
February
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Yua Takise
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Kyou Takise
-
Chiharu Sakaki
March
-
Kaede Mikuriya
April
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Kazuya Yamanashi
May
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Rio Nakashizu
June
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Naoki Yamanashi
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Jun Tsuzuki
July
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Akari Yamanashi
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Yuuichi Shido
August
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Kouhei Tose
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Michitaka Nanba
September
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Iori Haijima
October
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Mashuu Kirinoe
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Makoto Yanagi
November
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Takumi Yura
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Tougo Takise
December
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Anju Ikagura