The ninjobon refers to a genre of gesaku literature (literary work of a playful, mocking, joking, silly or frivolous nature) written during the Edo period that mainly dealt with decadent love affairs and contemporary life of Edo (now Tokyo).
人情本（にんじょうぼん）とは、江戸時代の戯作文芸の一種で、退廃的な恋愛や風俗を中心に描いたもの。