The Earth Empire, uniting hundreds of planets, is entangled in a conspiracy that threatens to plunge its inhabitants into the chaos of a bloody war. The Imperial Security Service learns that on the day of Crown Princess Edna's coronation, a conspiratorial fleet is attacking Earth. Is it still possible to prevent the collapse of the empire? Hopes for success are negligible, but special agents Jules and Yvette d'Alembert have repeatedly proven that they are capable of carrying out "impossible" tasks. However, this time they are confronted by a well-prepared and informed enemy who will stop at nothing...