Sayaka Ayato is the most friend-oriented and family-oriented person in the world. She is well-liked by everyone and has a boyfriend named "Touki Kiba" because of her good nature.

Then one day, their smooth sailing life, free from any inconvenience, is destroyed by a mysterious assailant. Suddenly abducted, "Sayaka" is used as a test subject ...... and learns a shocking fact.

"You're a zombie now." "I'm not just a zombie, my body aches if I don't have sex, I die if I don't have sex for a week at a time." 'The type of sex you want varies from person to person, so you'll have to figure out for yourself what kind of sex satisfies your thirst."

Fortunately, Sayaka has a boyfriend, Touki. And sex with him was supposed to satisfy ... my thirst ...

"You seem to get tingles that only stop if it's a sexual act of taking another person's partner."

Sexual intercourse with someone else's partner - in other words, "cuckolding". No matter how many times you deal with "Touki", you can't feed it sex as a zombie.

Thus, "Sayaka" is forced to make the ultimate choice between her life and her feelings...