Si Qin, who lives in the United States, went to watch a tennis match with his father when he returned to Japan, and was deeply attracted by the boy who was victorious on the court at that time - Yukimura Seiichi.
From then on, she asked her sister, who was going back to Japan to study soon, to collect any news about Yukimura. In the winter of one year, she learned that he was hospitalized due to illness, and she hurried back to Japan in desperation. . . . . .