Inshitsu Otaku ni Ikareru Kanojo

Based on the erotic game by Pin-Point. 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…