Inshitsu Otaku ni Ikareru Kanojo 2

Shuji lives a peaceful life with his younger sister, Saki. But he secretly loves

her and his libido gets uncontrollable day by day. One day, Saki tells him, "I

love you.... I've been always thinking about you since I was a kid...." Like

this, they become boyfriend/girlfriend. However, their happiness is destroyed

by an email. "I know your everything...." The email attaches a photo of Saki

changing clothes and masturbating. Saki thinks her stalker did it. The stalker

gives her various immoral orders. She first tries to resist it, but she gradually

gets addicted to it.... Well, will Shuji be able to save Saki...?