Princess Silvia, a beautiful foreign student from the Cerulean Kingdom, overrules the objections of her five escorts and offers to share a room with Mizuki, who was assigned as a translator and friend by the Japanese police. Silvia wanted to freely enjoy life in Japan with Mizuki, not as a princess, but as an ordinary student. However, there was a rumor about the princess: in the countries she visited, jewel thieves dressed in silver clothes appeared. The Japanese police were not the only ones who suspected a connection between the silver thieves and the princess...