By chance, Adam (Kristen Slater Christian Slater), a boy with congenital heart disease, meets a beautiful girl named Caroline (Marissa Tomei Marisa Tomei). The cheerfulness and kindness of the latter gradually attract Adam, who has been living in the shadow of the disease, and there is a sincere and beautiful relationship between them. Adam was so convinced that he didn't even want to undergo heart surgery that could save his life when someone told Adam that in his chest was the heart of a baboon king. Because he wanted to keep the heart of the baboon king who was full of love for Caroline. On Adam's birthday, he and Caroline went to the stadium to watch the hockey game. While Caroline was immersed in Adam's meticulous care and love, Adam's life was nearing the end.