[ Animation XXX ]Inshitsu Otaku ni Ikareru Kanojo 3

Saki, Shuji's younger sister, has a pleasant existence with the two of them. The truth is that he secretly loves her, and his desire is becoming more uncontrolled. Saki tells him she loves him one day. Since I was a child, I've been thinking about you. As a result, they get romantically involved. An email, on the other hand, shatters their joy. I know every detail of your life... A picture of Saki masturbating and changing her clothing is attached to the email. Saki believes that her stalker is responsible for the death of her best friend's dog. Her stalker issues her a slew of unethical directives. Her initial resistance quickly fades away as she becomes hooked on the drug. Is Shuji capable of saving Saki...?