In the heart of the tale lies Testa, a gifted linguist and university professor, mentored by the seasoned Sergeant Rossa into the world of the Allied Cryptanalysis Department. His mission: to decipher the cryptic code of enemy werewolves, concealing their radio messages behind wolfish howls. Despite his relentless efforts, Testa hits a dead end in decoding the mysterious transmissions. Determined to unveil the secrets within, he embarks on a daring quest to ensnare a live werewolf. Amidst his exhaustive search, he encounters a female werewolf named Yonaga, marking a crucial turning point in his cryptanalytic journey.