Two boys grew up together in a certain village—Yoshiki and Hikaru. One day, Yoshiki became certain that Hikaru was no longer himself. He decided to accept the new "Hikaru," no matter what happened with his friend. But now he has decided to investigate the story of “Nunuki-sama” and Kumbitachi to understand exactly what this creature is. The situation develops unpredictably, beyond the boys' control. Who will make the next move and what will they discover?