The story happens in the near future of Japan, where sexual activity is forbidden by law. Inuda Hikaru is an honor student whose father is an executive at Setori (Sexual Misconduct Control Bureau of the Ministry of Health, Labor and Welfare). Hikaru aspires to become like his father and finds sex unpleasant. Minase Yu is Hikaru's childhood friend who has a sharp tongue but excels in her grades. Yu is also a big fan of nationally known actress Uchu Misora, commonly known as Uchura. One day, Hikaru is invited by a classmate to a shady members-only club where he witnesses men and women engaging in illegal sexual acts. He is also surprised to see Uchura, who claims to be "pure" there with a man. Before he realised, Hikaru finds himself being caught in an "underworld organization" where sexual activity is performed.

One morning, students find their homeroom teacher Tokuyama Daigoro’s body on the floor of the classroom. A strange school life begins as the students work hard to hide the presence of their teacher's corpse in their classroom. Other teachers from the Academy, their homeroom teacher's wife, his mistress, police, and reporters... One-by-one they visit the classroom and the students face the risk of being discovered. Is it possible to continue to hide it?! And who was it who killed him?!

21 female high school students are locked in a classroom and their footage is shown all over the world in real time. The only way to escape is to receive many "likes" from the audience.