A little girl always plays on the stepping stones in the brook. A shy little boy hovers around her unable to ask her that he wishes to be alone. Suddenly, it rains and they seek shelter together, which brings them closer. However, the little boy has a secret.

Sonagi is an animated adaptation of a book called “Rain Shower” by the author Hwang Sun-won, the short story was written while he lived as a refugee with his family during the Korean War.