Because of her sad past, Amehara Ame has no confidence in herself and does not open her heart to others. However, one day when she returns to her hometown of Nagasaki, she reunites with the only man in the past who has a connection with her and whom she still remembers - Asano Taiyo. However, the joy of reunion only lasts for a while, and he encounters an accident. In front of the grief-stricken Ame, a man who claims to be a guide from another world says, "If you are willing to 'give up your heart', then from now on, I will create a miracle for you." But the guide's condition of "giving up your heart" is too cruel for Ame. What does Ame's heart in exchange for a miracle mean? And then, what will happen to the two according to the guide's "miracle"? Ame and Taiyo, who miss each other wholeheartedly, are two people with completely opposite names. The purest love story of this winter is about to begin.