** spoiler alert ** 
 *Spoilers* 
 You don't know how much I love this series. Sora, Riku and Kairi are best-friends who become separated from each other during the destruction of their island by 'The Heartless'. It follows Sora's search for Kairi and coming to terms with being 'The Keyblade Master' and Riku's turn to darkness and his struggle to find Kairi's heart. The ending is ever so sad, and although the book does it justice, i urge you to look up the ending to Kingdom Hearts the video game on youtube as well. This is such an amazing series that never fails to leave me with less the dry eyes :)