My best friend, Zuo Ci, sent me a video of him having sex as a thank you for always borrowing his notebook, but then I got a message saying it was sent to the wrong person and I had to delete it... But I couldn't contain my lust, so I secretly checked the contents. And what I saw on the screen was... my mom!? My mind went into a panic, and I didn't have the courage to ask to find out the truth, so the days just passed by. Then, one day, when I got home, there was something strange about the atmosphere...