In the year 20×× of the Gregorian calendar, after the Juvenile Law was revised, juvenile prisons operated by private companies were created. One of them was called "Hope Prison", which had no restrictions on prisoners during the period of detention, and was commonly known as "Majisu Ka Prison". The imprisoned girls tried their best to steal illegal information from the prison. Nobunaga, the leader of the Viper Group, used his own body as a shield to send Hope out of the prison. Outside the prison, a girl had been waiting for two full years...