Check for characters missing birthday info here.
January
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Satsuki Kururugi
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Mutsuki Kururugi
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Momosuke Oikawa
February
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Chaoyang Li
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Akio Tobikura
March
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Noah
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Kanata Minato
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Futami Akabane
April
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Lucas
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Aoi Kakitsubata
May
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Issei Todoroki
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Hikaru Orihara
June
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Eva Armstrong
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Tatsumi Madarao
July
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Mio Yamanobe
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Ban Jumonji
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Rabi
August
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Tsubaki Rindo
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Raku Wakaouji
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Akira Mitsurugi
September
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Kokoro Hanabusa
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Kyosuke Momoi
October
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Leon
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Takamichi Sanzenin
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Torahiko Kusakabe
November
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Shiki Amabe
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Runa Kagurazaka
December
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Toya Honoki
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Seiya Aido