Harutora Tsuchimikado

The main protagonist and the son of the branch family of Tsuchimikado clan. Despite being born into a distinguished onmyouji family, he has no magical powers. He had been living a normal and laid back life seeing that he could not accomplish anything without any magical powers. When he was young, he made a promise with Natsume to become her shikigami and protect her. Spoiler Later in the Light Novel the real identity of Harutora is revealed, he's the real reincarnation of Yakou Tsuchimikado. When he and Natsume were born they exchanged their places, he was sent to the branch family and Natsume was sent to the main family. (Source: Wikipedia)