[ Hentai Sex ] Inshitsu Otaku Ni Ikareru Kanojo 01

Shuji leads a peaceful existence alongside his younger sister, Saki. However, he secretly adores her, and his libido becomes increasingly uncontrollable with each passing day. Saki tells him one day, "I adore you.... I've been thinking about you constantly since I was a child..." In this manner, they acquire the status of boyfriend/girlfriend. Their happiness, however, is snuffed out by an email. "I am aware of everything about you..." The email includes a photograph of Saki changing into a new outfit and masturbating. Saki believes her stalker is responsible. The stalker issues her numerous unethical commands. She initially attempts to resist, but gradually develops an addiction to it.... Will Shuji, on the other hand, be able to save Saki...?