An eighteen-year-old young man in the employment of the city. He is the director of the Hiizumi Life Counseling Office and the only human who works there. He is able to perform "tuning"; an ability that can send back youkai to their world and cut off their connection to the human world. This ability can only be used by his family; the one who succeeds this ability is called oyakume. His hair grows longer whenever he uses his ability. Because of this ability, some of the youkai view the oyakume as murderers. In the manga, Akina reveals that he can use the ability in chapter eight, although he tells everyone that he tuned Gin before the start of the series. In the anime, he is able to use "tuning" from the very start. According to him, the final destiny of the oyakume is to be tuned by his successor in order to maintain the balance between the human and youkai worlds, and just as he had to tune his grandfather who was the previous oyakume, he will be tuned by the next oyakume when the time comes for him to take over his position.
Source from Wikipeida