In a post-apocalyptic 2030 Japan, a devastating virus called Gibia has transformed the populace into grotesque monsters.
Hope emerges in the form of two warriors, a samurai and a ninja, who have traveled through time from the Edo period.
They find themselves tasked with assisting a dedicated professor in his quest to discover a cure for this terrifying plague.
Their journey is fraught with danger, as they must battle not only the monstrous Gibia, but also ruthless outlaws and other hostile forces, all while striving to save what remains of humanity.