Kawamura (Okayama Amane) is a ward office worker who is about to get married to her boyfriend, Shiori (Fukagawa Mai). One day, he learns that he is under fire on the Internet when a woman he argued with over a welfare application commits suicide. The site that set Kawamura ablaze was a backdoor members-only site called the "Private Punishment Club. The next thing he knows, he is cornered by the Private Punishment Club's false sense of justice and the curiosity of the public...

University student Imai (Suga Kenta) is invited by his classmate Kajiwara (Furukawa Takeshi) to collaborate on a report on criminal psychology. The two begin playing detective to uncover the modus operandi of the crime, using the case of an idol being stalked online as their theme. Meanwhile, Riricchi, the idol they are playing detective with, receives a creepy wedding cake...