暗号学園のいろは (Series) favorite_border

Volume 1 Introduction: In preparation for the coming world war, a military academy for girls who are skilled at deciphering codes. The name of the school is "Crypto Academy"!　Iroha Iroha enrolls in this high school, unaware that it is such a high school, and by chance she gets caught up in a crypto battle that puts her school life on the line.... Iroha struggles, but in her hand she holds the key that can stop any war...?　Fifteen girls solve the cipher after the gun!　The outlandish school myster...