When Miyu was a child, her father died before she had turned fourteen years old, and her mother had been overwhelmed by this. A well acquainted magician named Kitjutsushi asks the mother for permission to bring Miyu with him to assist in his magic show, after Miyu first met Reiha as the daughter of this magician. Miyu rehearses a skit with them, first not knowing it was a ritual to awaken her powers as a shinma guardian, but later explained by her mother. A man named Black Kite transforms into a shinma, recognized as Tonbi, then attacks and kills Kitjutsushi. After Miyu's mother is then murdered by Tonbi, Miyu realizes her fire powers and sends Tonbi into the darkness. From then on, Miyu embarks on a journey to cast all stray shinmas into the darkness.