Check for characters missing birthday info here.
January
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Akane Koumoto
-
Akari Koumoto
April
-
Kousuke Sakurada
May
-
Yuuta Shimada
-
Toko Shiragami
June
-
Nagisa Aizawa
-
Asahi Kuromine
July
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Shiho Shishido
-
Shiro
September
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Mikan Akemi
December
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Youko Shiragami
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Okada