100 million years in the past, an ecological catastrophe drove the Demon Beasts from our world. Now they have to breed with human females to create a brand new, hybrid creature who will clear the best way 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 Statement Agent Muneto to avoid wasting her from the terrifying creature to which she offers delivery: A mutant, lust-driven Demon Beast!