Angou Gakuen no Iroha: Tokubetsu Bangai-hen
暗号学園のいろは 特別番外編
Compilation
Cipher Academy
Angou Gakuen no Iroha· 暗号学園のいろは
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Iroha is an average student newly enrolled in Cipher Academy, a Spartan school where students must crack code after code after code with barely enough time to catch their breath! Then a mysterious person named Kogoe gives Iroha an unusual pair of glasses with a crazy secret behind them! (Source: MANGA Plus)