In a devastated, post-apocalyptic world, all men have turned into rape demons. The only hope for the future is to travel to the past and prevent the outbreak, the source of which still remains a mystery.

A young woman, Miyako responds to an advertisement for a live-in maid and is given a job alongside the playfully alluring Mai-chan. Miyako quickly learns that housecleaning is the least of her duties, as the master and his wife use the maids as toys in their unbridled erotic fantasies. Since Mai-chan possesses the uncanny ability to recover from any injury, no matter how severe, every violent desire is indulged. Miyako soon becomes actively involved in Mai-chan's horrific destruction and miraculous resurrection.

Shota is a high school student who is excited about love. His secret crush is on Hitomi, the best girl in the school. One day at lunchtime, Hitomi calls Shota out to her, and he does as she asks him to do, ending up losing his virginity. Still in disbelief, Shota decides to go to Hitomi's house after school that day. However, what awaits him at Hitomi's house is not a "sweet time for lovers", but a "cruelty-free eating". Hitomi has been infected with a zombie virus that is ravaging the streets of Japan...

Convinced of the final outcome, a team of scientists travels back in time to stop the spread of a virus turning men into zombified rapists through society and causes them to finally uncover the source of the deadly disease which causes them to attempt to stop it before it happens again.

Based on Shungicu Uchida's manga of the same name, which features themes of occultism and multiple personalities.