The Japanese game Valkyrie Drive: Bhikkhuni has been banned from being sold in Germany and Australia. The game was refused classification by the German USK and Australian OFLC.
Classification entities like USK and OFLC put age categories on games depending on the content that is included. Both Germany and Australia have laws that prohibit the display of certain types of media if it is deemed inappropriate for people under the age of 18.
In both countries games that are deemed inappropriate are put on an index. In Germany the Federal Department of Media Harmful to Young Persons, or BPjM, maintains a list known as the List of media harmful to young people.