Hyper—a constitution that only a tiny fraction of women are born with. These women are called Hyper-Girls, and they are objects of fear, treated as sentient natural disasters due to their flatulence that defies human common sense. Damage from the so-called 'fart terrorism' of Hyper-Girls occurs daily all over the world. Nowadays, people regard them like natural disasters such as typhoons or earthquakes; ordinary people have half-given up on punishing them and simply live in fear.