The Prince and his bodyguards have both discovered that his bride-to-be has planted listening devices in their home and in Yukitaka's home in order to spy on the Prince. At the same time, the Prince notices that the woman appears to be a bit too interested in marrying him. He finds out that the woman and his supposed brother are actually imposters from Dogura's sister planet Magura, which been trying to proclaim its independence from the Doguran monarchy. If the Prince marries a Maguran princess, then she'll have a lot more leverage to grant Magura their independence. And as added insurance, if the Prince tries to escape the wedding there's a possibility that the alien ships in orbit around Earth might just destroy it instead to prevent the Prince from escaping.
As the net closes in on him, the Prince must once again gather his wits to find a way out of this situation.