100 million years in the past, an ecological catastrophe drove the Demon Beasts from our world. Now they need to breed with human females to create a brand new, hybrid creature who will clear the way in which for an invading horde. When 19-year-old Kayo is raped by a possessed lover, it is as much as 19-year-old Interplanetary Mutual Commentary Agent Muneto to avoid wasting her from the terrifying creature to which she offers start: A mutant, lust-driven Demon Beast!