The main character is Princess Selina. She is a princess of the prosperous West European Melberg countries. Hiding her true identity, she came to study in Japan in an ordinary school. Since she is a distant relative of a certain Yiu, she decides to settle in his house. Once a princess of another resource-rich country, Marualand Olivia, was sent to Japan as a result of a coup d'état. Upon arriving in Japan, she was welcomed as an honored guest. Yiu is attracted to Olivia, but Selina tells her not to get close to him, as he is the most valuable person to her. This is where the confrontation between the two princesses begins.