In a world plagued by demons eight centuries ago, humanity's prayers birthed powerful deities called 'Idaten' who saved them from extinction. Now, unaware of the demons' menace, the current Idaten, mentored by the lone survivor Rin, face an era of peace. But as the oppressive Zoble Empire revives a demon, these inexperienced gods must confront their ancient foes and rediscover their purpose on the battlefield.