In the world of Japanese death-metal, Seikima II emerges as a band adorned in kabuki makeup, delving into dark themes of violence and satanic allure. The OVA delves into the band's origins, portraying them as actual demons hailing from the abyssal realm of Makai. Led by Demon Kogure, the band's frontman, these malevolent entities scheme for humanity's downfall. Standing in their way is the virtuous Rosa, who conceals her true identity as the reformed war deity Freyja. As the demons strive to unleash their apocalyptic weapon, the Tower of Babel, Rosa races to complete her own countermeasure, the Tower of Cain. Just when all seems lost, a surprising twist occurs as the demons opt to switch their diabolical plans for a more unconventional path—forming a rock band to spread their demonic cult among the masses.