Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai

In a future Japan ruled by extreme morality laws, words, images, and even gestures considered obscene are monitored so aggressively that an entire generation has grown up almost ignorant of sexual expression. Tanukichi Okuma enters an elite school hoping to get closer to his childhood crush, the seemingly perfect student council president Anna. Instead, he is dragged into the secret life of vice president Ayame Kajou, who is also Blue Snow, a masked terrorist spreading forbidden jokes and indecent material in protest against censorship. Forced to assist her, Tanukichi becomes trapped between a society terrified of anything suggestive and an absurd rebellion determined to flood that society with exactly what it banned.