In 20xx, the national government began taking measures to combat the declining birthrate by making marriage compulsory and having a　pharmaceutical company create a sex-enhancing drug but the failure caused a sex zombie to spread

Will Kaela and Asako, the only two survivors, be able to survive?

kaela:Asako... No matter how far I run, there are zombies all around me... I'm surrounded by gas from the aphrodisiac they're giving off, it's making me go crazy, and my private parts are tingling too...

Asako: Kaela... just hold on for now... use the device you have and check the exit from the city! I'll beat the zombies to death! We need to get to the exit quickly, otherwise the concentration of aphrodisiac gas here will get really weird...

``Asako: Sex virus infection level: 0%

Kaela: Sex virus infection level: 0%``