Having lost his parents at a young age, Sehyun finds his life endlessly miserable. But when he meets Yuno, a mysterious boy who magically appeared before him, the two quickly find solace in one another. As Yuno visits Sehyun every week, their feelings gradually become more complex as they grow up. With rain pouring down on Sehyun's dating life and dark clouds shrouding Yuno's family life, will they each find what they need once the skies clear? Or will the storm wash away what could have been?