Kazuma Yagami is a user of "Fuujutsu," the ability to control the wind. He returns to his old home, the noble Kannagi household, after being banished four years ago for his inability to control fire and his subsequent defeat in a duel at the hands of his younger cousin, Ayano Kannagi. Returning after such a brutal exile already gives rise to many conflicts, but to make matters worse, several Kannagi family members have recently been murdered with Fuujutsu. This leads the Kannagi family, including the hot-headed Ayano, to suspect Kazuma as the culprit. Now, Kazuma must not only clear his name, but also aid the family he shares a mutual hatred with, in order to discover the true identity of the killer. Ayano is the heir to the house of Kannagi, a house with ties to the Spirit of Fire whose members are all fire users. All except for her cousin, Kazuma. After he was defeated by Ayano, his father banished him from the house in disgrace. Kazuma runs off and changes his surname to Yagami. He forms a contract with the Spirit of Wind and becomes a powerful wind user.