Ten years ago, the Ryoma family adopted a heroine who lost her memory after being seriously injured in the United States, and named her Echizen Yuci. Five years later, the Ryoma family decided to return to Japan. Unexpectedly, Yu Ci had a car accident the day before boarding the plane. Long Ya accompanied her to recuperate at the San Francisco International Hospital in the United States while working professionally. While Yu Ci was recuperating, she obtained a doctorate in history from Harvard University and served as Long Ya's tennis coach. However, she was very afraid of physical contact with tennis-related things. Five years later, he returned to China and became a freshman in the History Department of Dongda University. He met the princes and a series of stories were derived from them. Later, the appearance of Chinese student Liu Haosheng was like a bait, gradually bringing back her unknown past...