Kyuta, a young boy living on the streets of Shibuya, is taken in by Kumatetsu, a rough-around-the-edges warrior from the Beast Kingdom, who's been searching for the perfect apprentice. Despite their constant bickering, Kyuta and Kumatetsu begin training together and discover that master and student each have lessons to share. But when a deep darkness threatens to throw their world into chaos, the bond between this unlikely pair will be put to the ultimate test in this emotional and action-packed epic from Academy Award-nominated director Mamoru Hosoda (BELLE).