Kei Sakai, a high school boy, had a problem. One thing led to another, and he was deeply uninterested in everything and had no sexual desire. Then one day, he learns of a mysterious, beautiful girl named Yami, who is the gaining popularity on SNS, from a fellow part-timer. Yami is an unidentified internet idol who uploads naughty videos and pictures of herself in outrageous outfits, and has a huge following among men.

No one knows her real face, but Sakai recognizes a woman who resembles Yami. That person was Saki Miyashita, a classmate who sits next to him, and although she is far more plain than Yami, she shares Yami's figure and the position of her teardrop mole. Sakai, who had lost interest and sexual desire, decides to investigate Miyashita out of curiosity, in order to find Yami's true identity. However, unaware that it's Miyashita's trap, he ends up with a lewd, dangerous secret...!!?