Following the death of his parents in an accident, Teppei Kobayashi is taken in by his grandfather, Isshin Arima. Upon assuming his grandfather's surname, Teppei is designated as the heir to the Arima Financial Combine, a major power within Japanese industry. In keeping with his status as the heir to an industrial empire, he is admitted to one of Japan's most elite international schools. At the school, Teppei finds himself amidst women of high rank and noble demeanor. He soon develops feelings for Sylvia van Hossen, a European princess and fencing expert. However, Sylvia remains distant and hard to understand, while his maid, Yuu Fujikura, appears to be pursuing her own objectives. Will Teppei succeed in becoming the Princess Lover, or is his romance with Sylvia fated to end in failure?