One day, a young man got struck by the beauty of a girl accidentally met in his town streets.
He cheerfully approached her and the girl didn't seem bothered by the man's attitude, quite the opposite: she turns out to like his presence.
In the following days, the two met up again and after a while their friendly meetings turned into real dates. They deepened their knowledge and developed an attraction for each other.
One day they decided to take a room into a ryokan together, full of desires and expectations. There, they had their first passionate intercourse, starting to have a serie of sexual meetings in which they vented their lust in the wildest way possible.
However, one night, while the man was penetrating the girl anus, something horrific happened: the girl's neck began to stretch out, revealing a grotesque figure. The beautiful horny girl was nothing more than a Rokurokubi, a legendary monstrous woman of the japanese folkore.