Hina and Nata lived as childhood friends born on the same birthday of the same year. However, after the entering to high school, Nata decided to leave the town and gradually became estranged from Hina because of that. One day two witches Sabbath and Pargo mysteriously landed on Earth. Hina protected Nata from one of Sabbath's attack and receives a fatal injury. The other witch, Pargo who saw that gives Hina and Nata a magical power at a cost of his body, and tells Nata to go on an adventure with Hina to regain his lost body.