sentences:  The ero guro nansensu period is said to have ended with the start of NHK Kokuminkayō radio broadcasts during the same month.Along with several books which had managed to avoided censorship by the Ministry of Home Affairs, books of this theme that had been banned during this period are often circulated through book buying clubs as underground books and are subject to study and analysis.Many books of this era were banned for their propoundment of radical ideologies such as anarchism, but most were banned on the grounds of their ero guro nansensu content.