Renzoku bôkan

One evening, a porn projectionist seems troubled after seeing a movie in which a man wearing a red snake tattoo on his thigh rapes and kills a schoolgirl in the woods. The projectionist bearing a similar tattoo goes to the distribution company to find out who wrote the script and learns it's a young OL called Chioko Yamazaki. He thinks the girl witnessed a rape and murder he committed in the past in similar circumstances. He confronts her but she seems to know nothing about the incident.