Shimoneta to iu Gainen ga Sonzai Shinai Taikutsu na Sekai - Manmaruban下ネタという概念が存在しない退屈な世界 マン◯版; 没有下流概念的无聊世界; A Boring World Where the Concept of 'Dirty Jokes' Does Not Exist; Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai - Manmaru-Ban; Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai - Man• Ban; Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai Man• Ban

Set 16 years after the "Law for Public Order and Morals in Healthy Child-Raising" banned coarse language in the country. Tanukichi Okuma enrolls in the country's leading elite public morals school and is soon invited into the Anti-Societal Organization (SOX) by its founder, Ayame Kajō. As a member blackmailed into joining by Ayame, Tanukichi ends up taking part in obscene acts of terrorism against the talented student council president Anna (for whom Tanukichi has a crush).