The story takes place during World War II. Since radio communications were no longer safe, the British military began to train military pigeons and use them to communicate with the French underground resistance organization and the Allied forces. Seeing so many of its peers working for the country, the wild pigeon "Warrior" was eager to try. So, "Warrior" tried every means to get among the military pigeons. Compared with other military pigeons, the untrained "Warrior" seemed a little overwhelmed. But by chance, "Warrior" received the most severe task in World War II, to deliver the intelligence of the Normandy landing to the Allied forces. Facing the enemy's fierce military hunting falcons, can "Warrior" successfully complete the task?