Miyako starts a live-in maid job and quickly discovers that housecleaning is the least of her duties, as her employers use the maids in their twisted fantasies. Her co-worker Mai-chan, who can miraculously recover from any injury, becomes the focus of horrific, indulgent violence that Miyako is soon drawn into.
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.