Trying to save Ryou Asuka from the caterpillar demon Oysnas, Akira Fudo is thrown back through time alongside him, into eras where demons are already at work rewriting key moments of human history. Fudo and Asuka have to track down what the demons are changing and stop it before their own present stops existing. This spinoff manga is set between the second and third volumes of the original Devilman story.