Yonosuke Hikura appears to be an ordinary high school student. Yet he has inherited the important role of protecting the harmony between Heaven and Earth. With the help of the magical sword Chitentai, and Tsukinojo Inbe, he courageously battles the demons, sending them back to the Earth World, from which they have escaped.

In the 26th century, humans discover a humanoid race living on the distant world GO/7498/2, a dark-skinned, golden-eyed people who seem to eke out a primitive, carefree existence. However, a scout team from Earth discovers that there is more to them than meets the eye--they live in symbiosis with vicious reptilian parasites, and the Terran scientists have upset the delicate natural balance.