Where did Shinohara's ci come from?

This word comes from the Book of Songs.

The Book of Songs is the beginning of ancient Chinese poetry, which contains 3 1 1 poems from the Western Zhou Dynasty to the mid-Spring and Autumn Period.

Among them, "Ji Zi in the Right Wind" is a poem describing lovers' lovesickness, in which "Qing Zi admires me and I miss dragons. If I never visit you, can't you take the initiative? Come on, always open your eyes, on this high tower. I don't see you for a day, such as March. " This poem expresses deep thoughts between lovers.