Yonosuke Hikura appears to be an ordinary high school student. Yet he has inherited the important role, passed down through generations of his family, of protecting the harmony between Heaven and Earth. With the help of the magical sword Chitentai, and Tsukinojo Inbe, a Protector sent to him by the high Priests of Earth, he courageously battles demons, sending them back to the earth-like world, from which they have escaped.