Cipher Academy is a manga about a high school specialized in cryptography, where students compete in intense code-breaking battles. The story follows a boy named Iroha, who has a strong sense of justice but struggles academically, as he enrolls in the academy to help a girl named Kogoe protect her important secrets. Together with other talented classmates, they face deadly exams and rival schools using logic, wordplay, and codes. Readers enjoy the series for its clever puzzles, fast-paced strategic action, and the satisfying moments when characters solve complex ciphers under pressure.