The story begins with the protagonist leaving his town where people and Pokémon live in peace together in order to locate his father. The hero doesn’t know much about his father besides the fact that he is a powerful swordsman. On his journey, the protagonist meets up with new friends and foes and discovers the power of Burst Heart Crystals, these crystals entrap a Pokémon inside and allow humans transform themselves partly into them in order to take advantage of their special abilities and attacks.