From the introduction: This leaflet contains an abridged version of NIP'AJIN, a free and universal pen-and-paper role playing game. ... Decide upon a city, a criminal organization and a time period, for example the Mafia in New York during the 1950s or the Yakuza in contemporary Osaka. Your characters are petty crooks, forced to work as a group by the local Big Boss - the Game Master.