ZEX-369 I only dropped my cellphone... but I was trained by a stalker-like old man for several days. A record of those days.

Film Introduction

Mikako dropped her smartphone on the side of the road.
A stranger pervert who luckily picked it up used a hookup masturbation video found in the phone to blackmail and perversely imprison and train Mikako...
And then, Mikako unknowingly became beastly...