Fuji Riki, whose real name is Watanabe Riki. When I was a child, I lived in the United States with my parents (Watanabe), and I was a neighbor of the Echizen family. She and Ryoma learned tennis together, so after playing, Ryoma would always buy a can of her favorite grape-flavored Ponta. Over time, it became a habit. After his parents died in a car accident, he was adopted by a relative (Fuji) living in Japan, and he also inherited his father's company. For her with an IQ of 400, inheriting the company in her first year of junior high school was not a problem at all. She attended Hyōtei Academy High School in high school. For various reasons, she disguised herself as a man and went to Hyokui, where she happened to join the tennis club. A girl who has inherited the Fuji family's special taste and tennis talent, and the Watanabe family's stunning appearance, faces the prince of tennis, Echizen Ryoma, how will the story develop next?